Prepare CompositorWorker for per thread heap

third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp

Index: third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp b/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
index e99a78ae07f069e6da02503371368ff8fa3e6906..285ebe66cf38229044677a0b7fbc221aacca07e6 100644
--- a/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
+++ b/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
@@ -55,7 +55,7 @@ WorkerBackingThread::WorkerBackingThread(const char* name, bool shouldCallGCOnSh
 }
 
 WorkerBackingThread::WorkerBackingThread(WebThread* thread, bool shouldCallGCOnShutdown)
-    : m_backingThread(WebThreadSupportingGC::createForThread(thread))
+    : m_backingThread(WebThreadSupportingGC::createForThread(thread, true))

[haraken, 2016/08/22 14:24:44]

I'd prefer making this change in a separate CL so that we can revert the
per-thread heap if necessary.

BTW, maybe do we want to send a PSA to blink-dev@?

     , m_isOwningThread(false)
     , m_shouldCallGCOnShutdown(shouldCallGCOnShutdown)
 {