Prepare DedicatedWorker 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 a9cc00729bda991f880aaffbd5a8f0f838619df6..ec9d27cab60c77dde5b2490f0c3fefa7dbbd5ff1 100644
--- a/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
+++ b/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
@@ -47,8 +47,8 @@ static void removeWorkerIsolate(v8::Isolate* isolate)
     isolates().remove(isolate);
 }
 
-WorkerBackingThread::WorkerBackingThread(const char* name, bool shouldCallGCOnShutdown)
-    : m_backingThread(WebThreadSupportingGC::create(name, MainThreadHeapMode))
+WorkerBackingThread::WorkerBackingThread(const char* name, bool shouldCallGCOnShutdown, ThreadHeapMode threadHeapMode)
+    : m_backingThread(WebThreadSupportingGC::create(name, threadHeapMode))
     , m_isOwningThread(true)
     , m_shouldCallGCOnShutdown(shouldCallGCOnShutdown)
 {