Auto merge of #18890 - glennw:update-wr-clip-text-aa, r=jdm

Update WR (details below):

* Add support for clip masks on text runs.
* Fix atomic ordering of items with multiple shadows.
* Update to bincode + ipc-channel with optimizations.
* Fix some plane splitting precision errors.
* Improve the anti-aliasing quality significantly.
* Add internal ClipChain support.
* Fix diacritic glyphs on Linux.

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/18890)
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34 files changed, 87 insertions, 77 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 19ac18f08fd..1a6bbc9afe8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,7 +2,7 @@
 name = "webvr_traits"
 version = "0.0.1"
 dependencies = [
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
  "rust-webvr-api 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -149,11 +149,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bincode"
-version = "0.8.1"
+version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -209,7 +208,7 @@ dependencies = [
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bluetooth_traits 0.0.1",
  "device 0.0.1 (git+https://github.com/servo/devices)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "servo_config 0.0.1",
  "servo_rand 0.0.1",
  "tinyfiledialogs 2.5.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -220,7 +219,7 @@ dependencies = [
 name = "bluetooth_traits"
 version = "0.0.1"
 dependencies = [
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "servo_config 0.0.1",
@@ -308,7 +307,7 @@ dependencies = [
  "euclid 0.15.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "gleam 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
  "offscreen_gl_context 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -324,7 +323,7 @@ dependencies = [
  "euclid 0.15.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_derive 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "nonzero 0.0.1",
  "offscreen_gl_context 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -469,7 +468,7 @@ dependencies = [
  "gfx_traits 0.0.1",
  "gleam 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
  "net_traits 0.0.1",
@@ -502,7 +501,7 @@ dependencies = [
  "gfx 0.0.1",
  "gfx_traits 0.0.1",
  "hyper 0.10.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "layout_traits 0.0.1",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -695,7 +694,7 @@ dependencies = [
  "devtools_traits 0.0.1",
  "hyper 0.10.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper_serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
  "serde 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -712,7 +711,7 @@ dependencies = [
  "heapsize_derive 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.10.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper_serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
  "serde 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "servo_url 0.0.1",
@@ -1095,7 +1094,7 @@ dependencies = [
  "harfbuzz-sys 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_derive 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1128,7 +1127,7 @@ version = "0.0.1"
 dependencies = [
  "cssparser 0.22.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "gfx 0.0.1",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "style 0.0.1",
 ]
 
@@ -1419,10 +1418,10 @@ dependencies = [
 
 [[package]]
 name = "ipc-channel"
-version = "0.8.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bincode 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bincode 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1510,7 +1509,7 @@ dependencies = [
  "gfx_traits 0.0.1",
  "heapsize 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "html5ever 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
@@ -1558,7 +1557,7 @@ dependencies = [
  "gfx_traits 0.0.1",
  "heapsize 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "html5ever 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "layout 0.0.1",
  "layout_traits 0.0.1",
  "lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1591,7 +1590,7 @@ name = "layout_traits"
 version = "0.0.1"
 dependencies = [
  "gfx 0.0.1",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "metrics 0.0.1",
  "msg 0.0.1",
  "net_traits 0.0.1",
@@ -1665,7 +1664,7 @@ dependencies = [
  "gaol 0.0.1 (git+https://github.com/servo/gaol)",
  "gfx 0.0.1",
  "gleam 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "layout_thread 0.0.1",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
@@ -1795,7 +1794,7 @@ version = "0.0.1"
 dependencies = [
  "gfx 0.0.1",
  "gfx_traits 0.0.1",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
  "profile_traits 0.0.1",
@@ -1810,7 +1809,7 @@ dependencies = [
  "euclid 0.15.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "gfx 0.0.1",
  "gfx_traits 0.0.1",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "metrics 0.0.1",
  "msg 0.0.1",
  "net_traits 0.0.1",
@@ -1947,7 +1946,7 @@ dependencies = [
  "hyper-openssl 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper_serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "immeta 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "matches 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1994,7 +1993,7 @@ dependencies = [
  "hyper 0.10.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper-openssl 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper_serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
  "net 0.0.1",
  "net_traits 0.0.1",
@@ -2016,7 +2015,7 @@ dependencies = [
  "hyper 0.10.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper_serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
@@ -2368,7 +2367,7 @@ version = "0.0.1"
 dependencies = [
  "heartbeats-simple 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "influent 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "profile_traits 0.0.1",
@@ -2384,7 +2383,7 @@ dependencies = [
 name = "profile_tests"
 version = "0.0.1"
 dependencies = [
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "profile 0.0.1",
  "profile_traits 0.0.1",
 ]
@@ -2395,7 +2394,7 @@ version = "0.0.1"
 dependencies = [
  "energy-monitor 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "energymon 0.3.0 (git+https://github.com/energymon/energymon-rust.git)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "servo_config 0.0.1",
@@ -2606,7 +2605,7 @@ dependencies = [
  "hyper 0.10.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper_serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "js 0.1.6 (git+https://github.com/servo/rust-mozjs)",
  "jstraceable_derive 0.0.1",
  "lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2669,7 +2668,7 @@ dependencies = [
  "heapsize 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_derive 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "html5ever 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "metrics 0.0.1",
@@ -2716,7 +2715,7 @@ dependencies = [
  "heapsize_derive 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.10.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper_serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
  "net_traits 0.0.1",
@@ -3583,7 +3582,7 @@ dependencies = [
  "euclid 0.15.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.10.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
  "net_traits 0.0.1",
@@ -3600,10 +3599,10 @@ dependencies = [
 [[package]]
 name = "webrender"
 version = "0.52.1"
-source = "git+https://github.com/servo/webrender#cd4415aa563903f08ecd0602ec97a79879efcaf6"
+source = "git+https://github.com/servo/webrender#eb3ae93bdca0ad4a6281983af53101c578c964cf"
 dependencies = [
  "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "bincode 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bincode 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3628,10 +3627,10 @@ dependencies = [
 [[package]]
 name = "webrender_api"
 version = "0.52.1"
-source = "git+https://github.com/servo/webrender#cd4415aa563903f08ecd0602ec97a79879efcaf6"
+source = "git+https://github.com/servo/webrender#eb3ae93bdca0ad4a6281983af53101c578c964cf"
 dependencies = [
  "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "bincode 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bincode 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3639,7 +3638,7 @@ dependencies = [
  "dwrote 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.15.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -3650,7 +3649,7 @@ version = "0.0.1"
 dependencies = [
  "canvas_traits 0.0.1",
  "euclid 0.15.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
  "rust-webvr 0.9.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3778,7 +3777,7 @@ dependencies = [
 "checksum backtrace-sys 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "3a0d842ea781ce92be2bf78a9b38883948542749640b8378b3b2f03d1fd9f1ff"
 "checksum base64 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "96434f987501f0ed4eb336a411e0631ecd1afa11574fe148587adc4ff96143c9"
 "checksum binary-space-partition 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "88ceb0d16c4fd0e42876e298d7d3ce3780dd9ebdcbe4199816a32c77e08597ff"
-"checksum bincode 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6e4a2d3bab374f96192eade8f41914373d7b5fcf030ca2f45141f1e939057259"
+"checksum bincode 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9a6301db0b49fb63551bc15b5ae348147101cdf323242b93ec7546d5002ff1af"
 "checksum bindgen 0.29.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ba610cba0c1727ed837316540068b51349b8268c073906067b7c3948598929bd"
 "checksum bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "aad18937a628ec6abcd26d1489012cc0e18c21798210f491af69ded9b881106d"
 "checksum bitflags 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1370e9fc2a6ae53aea8b7a5110edbd08836ed87c88736dfabccade1c2b44bff4"
@@ -3885,7 +3884,7 @@ dependencies = [
 "checksum influent 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a22b311b83431be3ab9af96ca9ea41554bb4a8551ea871ae44c3ce0c57e55f2c"
 "checksum io-surface 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ad4578cee6ed49a17766fa608a4425008313c55ebb7a267622cbddd6b01751e2"
 "checksum iovec 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "29d062ee61fccdf25be172e70f34c9f6efc597e1fb8f6526e8437b2046ab26be"
-"checksum ipc-channel 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a38ad662f104525ac57012e0b79aad07507e3fc11e3bae668bf416264e760ebb"
+"checksum ipc-channel 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c10ed089b1921b01ef342c736a37ee0788eeb9a5f373bb2df1ba88d01125064f"
 "checksum itertools 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4833d6978da405305126af4ac88569b5d71ff758581ce5a987dbfa3755f694fc"
 "checksum itoa 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "eb2f404fbc66fd9aac13e998248505e7ecb2ad8e44ab6388684c5fb11c6c251c"
 "checksum jpeg-decoder 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "2805ccb10ffe4d10e06ef68a158ff94c255211ecbae848fbde2146b098f93ce7"
diff --git a/components/bluetooth/Cargo.toml b/components/bluetooth/Cargo.toml
index 45a1d381d9a..5683c7b8150 100644
--- a/components/bluetooth/Cargo.toml
+++ b/components/bluetooth/Cargo.toml
@@ -13,7 +13,7 @@ path = "lib.rs"
 bitflags = "0.7"
 bluetooth_traits = {path = "../bluetooth_traits"}
 device = {git = "https://github.com/servo/devices", features = ["bluetooth-test"]}
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 servo_config = {path = "../config"}
 servo_rand = {path = "../rand"}
 uuid = {version = "0.5", features = ["v4"]}
diff --git a/components/bluetooth_traits/Cargo.toml b/components/bluetooth_traits/Cargo.toml
index d67faf596fa..cb4009644cc 100644
--- a/components/bluetooth_traits/Cargo.toml
+++ b/components/bluetooth_traits/Cargo.toml
@@ -10,7 +10,7 @@ name = "bluetooth_traits"
 path = "lib.rs"
 
 [dependencies]
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 regex = "0.2"
 serde = "1.0"
 servo_config = {path = "../config"}
diff --git a/components/canvas/Cargo.toml b/components/canvas/Cargo.toml
index 00eb302369a..17b69b631e0 100644
--- a/components/canvas/Cargo.toml
+++ b/components/canvas/Cargo.toml
@@ -17,7 +17,7 @@ cssparser = "0.22.0"
 euclid = "0.15"
 fnv = "1.0"
 gleam = "0.4"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 log = "0.3.5"
 num-traits = "0.1.32"
 offscreen_gl_context = { version = "0.11", features = ["serde", "osmesa"] }
diff --git a/components/canvas_traits/Cargo.toml b/components/canvas_traits/Cargo.toml
index 8c514312511..54db398a681 100644
--- a/components/canvas_traits/Cargo.toml
+++ b/components/canvas_traits/Cargo.toml
@@ -14,7 +14,7 @@ cssparser = "0.22.0"
 euclid = "0.15"
 heapsize = "0.4"
 heapsize_derive = "0.1"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 lazy_static = "0.2"
 nonzero = {path = "../nonzero"}
 offscreen_gl_context = { version = "0.11", features = ["serde"] }
diff --git a/components/compositing/Cargo.toml b/components/compositing/Cargo.toml
index e8ed7c5d497..40ec9105448 100644
--- a/components/compositing/Cargo.toml
+++ b/components/compositing/Cargo.toml
@@ -14,7 +14,7 @@ euclid = "0.15"
 gfx_traits = {path = "../gfx_traits"}
 gleam = "0.4"
 image = "0.16"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 log = "0.3.5"
 msg = {path = "../msg"}
 net_traits = {path = "../net_traits"}
diff --git a/components/constellation/Cargo.toml b/components/constellation/Cargo.toml
index 2d659bd4342..0e48b302dc5 100644
--- a/components/constellation/Cargo.toml
+++ b/components/constellation/Cargo.toml
@@ -22,7 +22,7 @@ euclid = "0.15"
 gfx = {path = "../gfx"}
 gfx_traits = {path = "../gfx_traits"}
 hyper = "0.10"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 itertools = "0.5"
 layout_traits = {path = "../layout_traits"}
 log = "0.3.5"
diff --git a/components/devtools/Cargo.toml b/components/devtools/Cargo.toml
index 2ce43e5eb1f..f5d149f4099 100644
--- a/components/devtools/Cargo.toml
+++ b/components/devtools/Cargo.toml
@@ -13,7 +13,7 @@ path = "lib.rs"
 devtools_traits = {path = "../devtools_traits"}
 hyper = "0.10"
 hyper_serde = "0.7"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 log = "0.3.5"
 msg = {path = "../msg"}
 serde = "1.0"
diff --git a/components/devtools_traits/Cargo.toml b/components/devtools_traits/Cargo.toml
index fe0cc20c674..323cd25f946 100644
--- a/components/devtools_traits/Cargo.toml
+++ b/components/devtools_traits/Cargo.toml
@@ -15,7 +15,7 @@ heapsize = "0.4"
 heapsize_derive = "0.1"
 hyper = "0.10"
 hyper_serde = "0.7"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 msg = {path = "../msg"}
 serde = "1.0"
 servo_url = {path = "../url"}
diff --git a/components/gfx/Cargo.toml b/components/gfx/Cargo.toml
index c8ee2d49629..405d9db5646 100644
--- a/components/gfx/Cargo.toml
+++ b/components/gfx/Cargo.toml
@@ -23,7 +23,7 @@ gfx_traits = {path = "../gfx_traits"}
 harfbuzz-sys = "0.1"
 heapsize = "0.4"
 heapsize_derive = "0.1"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 lazy_static = "0.2"
 libc = "0.2"
 log = "0.3.5"
diff --git a/components/gfx/display_list/mod.rs b/components/gfx/display_list/mod.rs
index e0284b73805..341024b63ee 100644
--- a/components/gfx/display_list/mod.rs
+++ b/components/gfx/display_list/mod.rs
@@ -606,7 +606,7 @@ pub enum DisplayItem {
     Line(Box<LineDisplayItem>),
     BoxShadow(Box<BoxShadowDisplayItem>),
     PushTextShadow(Box<PushTextShadowDisplayItem>),
-    PopTextShadow(Box<PopTextShadowDisplayItem>),
+    PopAllTextShadows(Box<PopAllTextShadowsDisplayItem>),
     Iframe(Box<IframeDisplayItem>),
     PushStackingContext(Box<PushStackingContextItem>),
     PopStackingContext(Box<PopStackingContextItem>),
@@ -1190,7 +1190,7 @@ pub struct PushTextShadowDisplayItem {
 
 /// Defines a text shadow that affects all items until the next PopTextShadow.
 #[derive(Clone, Deserialize, HeapSizeOf, Serialize)]
-pub struct PopTextShadowDisplayItem {
+pub struct PopAllTextShadowsDisplayItem {
     /// Fields common to all display items.
     pub base: BaseDisplayItem,
 }
@@ -1248,7 +1248,7 @@ impl DisplayItem {
             DisplayItem::Line(ref line) => &line.base,
             DisplayItem::BoxShadow(ref box_shadow) => &box_shadow.base,
             DisplayItem::PushTextShadow(ref push_text_shadow) => &push_text_shadow.base,
-            DisplayItem::PopTextShadow(ref pop_text_shadow) => &pop_text_shadow.base,
+            DisplayItem::PopAllTextShadows(ref pop_text_shadow) => &pop_text_shadow.base,
             DisplayItem::Iframe(ref iframe) => &iframe.base,
             DisplayItem::PushStackingContext(ref stacking_context) => &stacking_context.base,
             DisplayItem::PopStackingContext(ref item) => &item.base,
@@ -1373,7 +1373,7 @@ impl fmt::Debug for DisplayItem {
                 DisplayItem::Line(_) => "Line".to_owned(),
                 DisplayItem::BoxShadow(_) => "BoxShadow".to_owned(),
                 DisplayItem::PushTextShadow(_) => "PushTextShadow".to_owned(),
-                DisplayItem::PopTextShadow(_) => "PopTextShadow".to_owned(),
+                DisplayItem::PopAllTextShadows(_) => "PopTextShadow".to_owned(),
                 DisplayItem::Iframe(_) => "Iframe".to_owned(),
                 DisplayItem::PushStackingContext(_) |
                 DisplayItem::PopStackingContext(_) |
diff --git a/components/layout/Cargo.toml b/components/layout/Cargo.toml
index 273a1446a75..2becf6a5675 100644
--- a/components/layout/Cargo.toml
+++ b/components/layout/Cargo.toml
@@ -20,7 +20,7 @@ gfx = {path = "../gfx"}
 gfx_traits = {path = "../gfx_traits"}
 heapsize = "0.4"
 html5ever = "0.20.0"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 libc = "0.2"
 log = "0.3.5"
 msg = {path = "../msg"}
diff --git a/components/layout/display_list_builder.rs b/components/layout/display_list_builder.rs
index 522766b5f6d..f29a1f377ae 100644
--- a/components/layout/display_list_builder.rs
+++ b/components/layout/display_list_builder.rs
@@ -28,7 +28,7 @@ use gfx::display_list::{BorderRadii, BoxShadowClipMode, BoxShadowDisplayItem, Cl
 use gfx::display_list::{ClipScrollNodeType, ClippingRegion, DisplayItem, DisplayItemMetadata};
 use gfx::display_list::{DisplayList, DisplayListSection, GradientDisplayItem, IframeDisplayItem};
 use gfx::display_list::{ImageBorder, ImageDisplayItem, LineDisplayItem, NormalBorder, OpaqueNode};
-use gfx::display_list::{PopTextShadowDisplayItem, PushTextShadowDisplayItem};
+use gfx::display_list::{PopAllTextShadowsDisplayItem, PushTextShadowDisplayItem};
 use gfx::display_list::{RadialGradientDisplayItem, SolidColorDisplayItem, StackingContext};
 use gfx::display_list::{StackingContextType, TextDisplayItem, TextOrientation, WebRenderImageInfo};
 use gfx_traits::{combine_id_with_fragment_type, FragmentType, StackingContextId};
@@ -2340,9 +2340,9 @@ impl FragmentDisplayListBuilding for Fragment {
             );
         }
 
-        // Pair all the PushTextShadows
-        for _ in text_shadows {
-            state.add_display_item(DisplayItem::PopTextShadow(Box::new(PopTextShadowDisplayItem {
+        // Pop all the PushTextShadows
+        if !text_shadows.is_empty() {
+            state.add_display_item(DisplayItem::PopAllTextShadows(Box::new(PopAllTextShadowsDisplayItem {
                 base: base.clone(),
             })));
         }
diff --git a/components/layout/webrender_helpers.rs b/components/layout/webrender_helpers.rs
index 8f86477e980..fbd5d423ddf 100644
--- a/components/layout/webrender_helpers.rs
+++ b/components/layout/webrender_helpers.rs
@@ -465,8 +465,8 @@ impl WebRenderDisplayItemConverter for DisplayItem {
                                         color: item.color,
                                     });
             }
-            DisplayItem::PopTextShadow(_) => {
-                builder.pop_shadow();
+            DisplayItem::PopAllTextShadows(_) => {
+                builder.pop_all_shadows();
             }
             DisplayItem::Iframe(ref item) => {
                 let rect = item.base.bounds;
diff --git a/components/layout_thread/Cargo.toml b/components/layout_thread/Cargo.toml
index 5bb340f893a..4106e86e47c 100644
--- a/components/layout_thread/Cargo.toml
+++ b/components/layout_thread/Cargo.toml
@@ -21,7 +21,7 @@ gfx = {path = "../gfx"}
 gfx_traits = {path = "../gfx_traits"}
 heapsize = "0.4"
 html5ever = "0.20.0"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 layout = {path = "../layout"}
 layout_traits = {path = "../layout_traits"}
 lazy_static = "0.2"
diff --git a/components/layout_traits/Cargo.toml b/components/layout_traits/Cargo.toml
index 6a6824463d4..872125c0d1b 100644
--- a/components/layout_traits/Cargo.toml
+++ b/components/layout_traits/Cargo.toml
@@ -11,7 +11,7 @@ path = "lib.rs"
 
 [dependencies]
 gfx = {path = "../gfx"}
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 metrics = {path = "../metrics"}
 msg = {path = "../msg"}
 net_traits = {path = "../net_traits"}
diff --git a/components/metrics/Cargo.toml b/components/metrics/Cargo.toml
index 96ce4108d32..2420d240da2 100644
--- a/components/metrics/Cargo.toml
+++ b/components/metrics/Cargo.toml
@@ -12,7 +12,7 @@ path = "lib.rs"
 [dependencies]
 gfx = {path = "../gfx"}
 gfx_traits = {path = "../gfx_traits"}
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 log = "0.3.5"
 msg = {path = "../msg"}
 profile_traits = {path = "../profile_traits"}
diff --git a/components/net/Cargo.toml b/components/net/Cargo.toml
index ef6dbe2a030..79e4eaa4778 100644
--- a/components/net/Cargo.toml
+++ b/components/net/Cargo.toml
@@ -19,7 +19,7 @@ hyper = "0.10"
 hyper_serde = "0.7"
 hyper-openssl = "0.2.2"
 immeta = "0.3.1"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 lazy_static = "0.2"
 log = "0.3.5"
 matches = "0.1"
diff --git a/components/net_traits/Cargo.toml b/components/net_traits/Cargo.toml
index 198e9ac9a85..ccc080e5863 100644
--- a/components/net_traits/Cargo.toml
+++ b/components/net_traits/Cargo.toml
@@ -16,7 +16,7 @@ heapsize_derive = "0.1"
 hyper = "0.10"
 hyper_serde = "0.7"
 image = "0.16"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 lazy_static = "0.2"
 log = "0.3.5"
 msg = {path = "../msg"}
diff --git a/components/profile/Cargo.toml b/components/profile/Cargo.toml
index a02914db61d..d00c0f5000d 100644
--- a/components/profile/Cargo.toml
+++ b/components/profile/Cargo.toml
@@ -15,7 +15,7 @@ unstable = []
 [dependencies]
 profile_traits = {path = "../profile_traits"}
 influent = "0.4"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 heartbeats-simple = "0.4"
 log = "0.3.5"
 serde = "1.0"
diff --git a/components/profile_traits/Cargo.toml b/components/profile_traits/Cargo.toml
index 67af6697aea..1f668086567 100644
--- a/components/profile_traits/Cargo.toml
+++ b/components/profile_traits/Cargo.toml
@@ -15,7 +15,7 @@ energy-profiling = ["energymon", "energy-monitor"]
 [dependencies]
 energy-monitor = {version = "0.2.0", optional = true}
 energymon = {git = "https://github.com/energymon/energymon-rust.git", optional = true}
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 log = "0.3.5"
 serde = "1.0"
 servo_config = {path = "../config"}
diff --git a/components/script/Cargo.toml b/components/script/Cargo.toml
index 6ae95d2fda0..9bb7f932cd4 100644
--- a/components/script/Cargo.toml
+++ b/components/script/Cargo.toml
@@ -49,7 +49,7 @@ html5ever = {version = "0.20", features = ["heap_size"]}
 hyper = "0.10"
 hyper_serde = "0.7"
 image = "0.16"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 js = {git = "https://github.com/servo/rust-mozjs", features = ["promises"]}
 jstraceable_derive = {path = "../jstraceable_derive"}
 lazy_static = "0.2"
diff --git a/components/script_layout_interface/Cargo.toml b/components/script_layout_interface/Cargo.toml
index 9dfad06a89c..47e47222c7d 100644
--- a/components/script_layout_interface/Cargo.toml
+++ b/components/script_layout_interface/Cargo.toml
@@ -19,7 +19,7 @@ gfx_traits = {path = "../gfx_traits"}
 heapsize = "0.4"
 heapsize_derive = "0.1"
 html5ever = "0.20.0"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 libc = "0.2"
 log = "0.3.5"
 metrics = {path = "../metrics"}
diff --git a/components/script_traits/Cargo.toml b/components/script_traits/Cargo.toml
index 3e957cf29ae..88fb50c3384 100644
--- a/components/script_traits/Cargo.toml
+++ b/components/script_traits/Cargo.toml
@@ -20,7 +20,7 @@ heapsize = "0.4"
 heapsize_derive = "0.1"
 hyper = "0.10"
 hyper_serde = "0.7"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 libc = "0.2"
 msg = {path = "../msg"}
 net_traits = {path = "../net_traits"}
diff --git a/components/servo/Cargo.toml b/components/servo/Cargo.toml
index 3f7f3c82598..70e1a6c9000 100644
--- a/components/servo/Cargo.toml
+++ b/components/servo/Cargo.toml
@@ -39,7 +39,7 @@ env_logger = "0.4"
 euclid = "0.15"
 gfx = {path = "../gfx"}
 gleam = "0.4"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 layout_thread = {path = "../layout_thread"}
 log = "0.3"
 msg = {path = "../msg"}
diff --git a/components/webdriver_server/Cargo.toml b/components/webdriver_server/Cargo.toml
index 86df911fa7c..7c51bf6a7ea 100644
--- a/components/webdriver_server/Cargo.toml
+++ b/components/webdriver_server/Cargo.toml
@@ -15,7 +15,7 @@ cookie = "0.6"
 euclid = "0.15"
 hyper = "0.10"
 image = "0.16"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 log = "0.3.5"
 msg = {path = "../msg"}
 net_traits = {path = "../net_traits"}
diff --git a/components/webvr/Cargo.toml b/components/webvr/Cargo.toml
index 15622da20ad..c3a5d56b397 100644
--- a/components/webvr/Cargo.toml
+++ b/components/webvr/Cargo.toml
@@ -16,7 +16,7 @@ oculusvr = ['rust-webvr/oculusvr']
 [dependencies]
 canvas_traits = {path = "../canvas_traits"}
 euclid = "0.15"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 log = "0.3"
 msg = {path = "../msg"}
 rust-webvr = {version = "0.9", features = ["openvr"]}
diff --git a/components/webvr_traits/Cargo.toml b/components/webvr_traits/Cargo.toml
index 8e1b98f058e..2582d2a3e4b 100644
--- a/components/webvr_traits/Cargo.toml
+++ b/components/webvr_traits/Cargo.toml
@@ -10,7 +10,7 @@ name = "webvr_traits"
 path = "lib.rs"
 
 [dependencies]
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 msg = {path = "../msg"}
 rust-webvr-api = {version = "0.9", features = ["serde-serialization"]}
 serde = "1.0"
diff --git a/tests/unit/gfx/Cargo.toml b/tests/unit/gfx/Cargo.toml
index da081e341ff..b759f13422e 100644
--- a/tests/unit/gfx/Cargo.toml
+++ b/tests/unit/gfx/Cargo.toml
@@ -12,5 +12,5 @@ doctest = false
 [dependencies]
 cssparser = "0.22.0"
 gfx = {path = "../../../components/gfx"}
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 style = {path = "../../../components/style"}
diff --git a/tests/unit/metrics/Cargo.toml b/tests/unit/metrics/Cargo.toml
index 4cf1c52991f..3c5aabccb2e 100644
--- a/tests/unit/metrics/Cargo.toml
+++ b/tests/unit/metrics/Cargo.toml
@@ -13,7 +13,7 @@ doctest = false
 euclid = "0.15"
 gfx = {path = "../../../components/gfx"}
 gfx_traits = {path = "../../../components/gfx_traits"}
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 metrics = {path = "../../../components/metrics"}
 msg = {path = "../../../components/msg"}
 net_traits = {path = "../../../components/net_traits"}
diff --git a/tests/unit/net/Cargo.toml b/tests/unit/net/Cargo.toml
index f48abf6bb47..6c50275cfad 100644
--- a/tests/unit/net/Cargo.toml
+++ b/tests/unit/net/Cargo.toml
@@ -16,7 +16,7 @@ flate2 = "0.2.0"
 hyper = "0.10"
 hyper-openssl = "0.2"
 hyper_serde = "0.7"
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 msg = {path = "../../../components/msg"}
 net = {path = "../../../components/net"}
 net_traits = {path = "../../../components/net_traits"}
diff --git a/tests/unit/profile/Cargo.toml b/tests/unit/profile/Cargo.toml
index b52b947696a..36dbeb8ffb1 100644
--- a/tests/unit/profile/Cargo.toml
+++ b/tests/unit/profile/Cargo.toml
@@ -10,6 +10,6 @@ path = "lib.rs"
 doctest = false
 
 [dependencies]
-ipc-channel = "0.8"
+ipc-channel = "0.9"
 profile = {path = "../../../components/profile"}
 profile_traits = {path = "../../../components/profile_traits"}
diff --git a/tests/wpt/metadata-css/compositing-1_dev/html/mix-blend-mode-intermediate-element-overflow-hidden-and-border-radius.htm.ini b/tests/wpt/metadata-css/compositing-1_dev/html/mix-blend-mode-intermediate-element-overflow-hidden-and-border-radius.htm.ini
new file mode 100644
index 00000000000..eb7f7cf5d9e
--- /dev/null
+++ b/tests/wpt/metadata-css/compositing-1_dev/html/mix-blend-mode-intermediate-element-overflow-hidden-and-border-radius.htm.ini
@@ -0,0 +1,6 @@
+[mix-blend-mode-intermediate-element-overflow-hidden-and-border-radius.htm]
+  type: reftest
+  expected:
+    if os == "linux": FAIL
+  bug: https://github.com/servo/webrender/issues/1776
+
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-3d-rotateY-stair-below-001.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-3d-rotateY-stair-below-001.htm.ini
new file mode 100644
index 00000000000..e289cb82548
--- /dev/null
+++ b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-3d-rotateY-stair-below-001.htm.ini
@@ -0,0 +1,5 @@
+[transform-3d-rotateY-stair-below-001.htm]
+  type: reftest
+  expected: FAIL
+  bug: https://github.com/servo/webrender/issues/1776
+