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, 6 insertions, 5 deletions

diff --git a/components/script/dom/vrdisplay.rs b/components/script/dom/vrdisplay.rs
index 72b8e29a15c..481f10c30b5 100644
--- a/components/script/dom/vrdisplay.rs
+++ b/components/script/dom/vrdisplay.rs
@@ -31,7 +31,8 @@ use dom::vrpose::VRPose;
 use dom::vrstageparameters::VRStageParameters;
 use dom::webglrenderingcontext::WebGLRenderingContext;
 use dom_struct::dom_struct;
-use ipc_channel::ipc::{self, IpcSender};
+use ipc_channel::ipc::IpcSender;
+use profile_traits::ipc;
 use script_runtime::CommonScriptMsg;
 use script_runtime::ScriptThreadEventCategory::WebVREvent;
 use std::cell::Cell;
@@ -191,7 +192,7 @@ impl VRDisplayMethods for VRDisplay {
         }
 
         // If not presenting we fetch inmediante VRFrameData
-        let (sender, receiver) = ipc::channel().unwrap();
+        let (sender, receiver) = ipc::channel(self.global().time_profiler_chan().clone()).unwrap();
         self.webvr_thread().send(WebVRMsg::GetFrameData(self.global().pipeline_id(),
                                                         self.DisplayId(),
                                                         self.depth_near.get(),
@@ -216,7 +217,7 @@ impl VRDisplayMethods for VRDisplay {
 
     // https://w3c.github.io/webvr/#dom-vrdisplay-resetpose
     fn ResetPose(&self) {
-        let (sender, receiver) = ipc::channel().unwrap();
+        let (sender, receiver) = ipc::channel(self.global().time_profiler_chan().clone()).unwrap();
         self.webvr_thread().send(WebVRMsg::ResetPose(self.global().pipeline_id(),
                                                      self.DisplayId(),
                                                      sender)).unwrap();
@@ -324,7 +325,7 @@ impl VRDisplayMethods for VRDisplay {
         }
 
         // Request Present
-        let (sender, receiver) = ipc::channel().unwrap();
+        let (sender, receiver) = ipc::channel(self.global().time_profiler_chan().clone()).unwrap();
         self.webvr_thread().send(WebVRMsg::RequestPresent(self.global().pipeline_id(),
                                                           self.display.borrow().display_id,
                                                           sender))
@@ -357,7 +358,7 @@ impl VRDisplayMethods for VRDisplay {
         }
 
         // Exit present
-        let (sender, receiver) = ipc::channel().unwrap();
+        let (sender, receiver) = ipc::channel(self.global().time_profiler_chan().clone()).unwrap();
         self.webvr_thread().send(WebVRMsg::ExitPresent(self.global().pipeline_id(),
                                                        self.display.borrow().display_id,
                                                        Some(sender)))