Auto merge of #20132 - nakul02:issue_19223, r=jdm

Profiler for blocked IpcReceiver::recv()

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Implements feature #19223

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #19223 (github issue number if applicable).

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- [x] There are tests for these changes

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WIP.
@jdm - this is the new profiler : "Blocked at IPC Receive"
Should I dig through all the calls to `ipc::channel` and replace them with this profiled `IpcReceiver`?

![screenshot from 2018-02-27 01-35-37](https://user-images.githubusercontent.com/5394361/36721061-b46edea4-1b5e-11e8-91d6-7faba742f237.png)

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1 files changed, 4 insertions, 3 deletions

diff --git a/components/script/dom/screen.rs b/components/script/dom/screen.rs
index e83cffd93a4..193b7705a42 100644
--- a/components/script/dom/screen.rs
+++ b/components/script/dom/screen.rs
@@ -7,12 +7,13 @@ use dom::bindings::codegen::Bindings::ScreenBinding::ScreenMethods;
 use dom::bindings::inheritance::Castable;
 use dom::bindings::num::Finite;
 use dom::bindings::reflector::{Reflector, reflect_dom_object};
+use dom::bindings::reflector::DomObject;
 use dom::bindings::root::{Dom, DomRoot};
 use dom::globalscope::GlobalScope;
 use dom::window::Window;
 use dom_struct::dom_struct;
 use euclid::TypedSize2D;
-use ipc_channel::ipc;
+use profile_traits::ipc;
 use script_traits::ScriptMsg;
 use style_traits::CSSPixel;
 use webrender_api::DeviceUintSize;
@@ -38,7 +39,7 @@ impl Screen {
     }
 
     fn screen_size(&self) -> TypedSize2D<u32, CSSPixel> {
-        let (send, recv) = ipc::channel::<DeviceUintSize>().unwrap();
+        let (send, recv) = ipc::channel::<DeviceUintSize>(self.global().time_profiler_chan().clone()).unwrap();
         self.window.upcast::<GlobalScope>()
             .script_to_constellation_chan().send(ScriptMsg::GetScreenSize(send)).unwrap();
         let dpr = self.window.device_pixel_ratio();
@@ -47,7 +48,7 @@ impl Screen {
     }
 
     fn screen_avail_size(&self) -> TypedSize2D<u32, CSSPixel> {
-        let (send, recv) = ipc::channel::<DeviceUintSize>().unwrap();
+        let (send, recv) = ipc::channel::<DeviceUintSize>(self.global().time_profiler_chan().clone()).unwrap();
         self.window.upcast::<GlobalScope>()
             .script_to_constellation_chan().send(ScriptMsg::GetScreenAvailSize(send)).unwrap();
         let dpr = self.window.device_pixel_ratio();