[WIP]Implement Blink side changes for navigator.language(s) support for workers.

Source/core/workers/WorkerThread.h

Index: Source/core/workers/WorkerThread.h
diff --git a/Source/core/workers/WorkerThread.h b/Source/core/workers/WorkerThread.h
index 98c75ec8019c0c08645fdbc0678b4e2aa993388f..58fb861d98e0b3e132437e5b3af7fcaef664ea03 100644
--- a/Source/core/workers/WorkerThread.h
+++ b/Source/core/workers/WorkerThread.h
@@ -31,8 +31,10 @@
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "platform/SharedTimer.h"
-#include "platform/WebThreadSupportingGC.h"
+#include "platform/heap/glue/MessageLoopInterruptor.h"
+#include "platform/heap/glue/PendingGCRunner.h"
 #include "platform/weborigin/SecurityOrigin.h"
+#include "public/platform/WebThread.h"
 #include "wtf/Forward.h"
 #include "wtf/MessageQueue.h"
 #include "wtf/OwnPtr.h"
@@ -97,6 +99,9 @@ namespace blink {
 
         void interruptAndDispatchInspectorCommands();
         void setWorkerInspectorController(WorkerInspectorController*);
+        void postTaskLanguageChanged();
+        // static void notifyAcceptLanguagesChanged(const String& newLanguagesList);
+        static void notifyAcceptLanguagesChanged(const Vector<String>& newLanguagesList);
 
     protected:
         WorkerThread(WorkerLoaderProxy&, WorkerReportingProxy&, PassOwnPtrWillBeRawPtr<WorkerThreadStartupData>);
@@ -121,7 +126,9 @@ namespace blink {
         bool m_terminated;
         OwnPtr<WorkerSharedTimer> m_sharedTimer;
         MessageQueue<WorkerThreadTask> m_debuggerMessageQueue;
+        OwnPtr<PendingGCRunner> m_pendingGCRunner;
         OwnPtr<WebThread::TaskObserver> m_microtaskRunner;
+        OwnPtr<MessageLoopInterruptor> m_messageLoopInterruptor;
 
         WorkerLoaderProxy& m_workerLoaderProxy;
         WorkerReportingProxy& m_workerReportingProxy;
@@ -144,7 +151,7 @@ namespace blink {
         // shut down. By deleting the WebThread first, we can guarantee that
         // no pending tasks on the thread might want to access any of the other
         // members during the WorkerThread's destruction.
-        OwnPtr<WebThreadSupportingGC> m_thread;
+        OwnPtr<blink::WebThread> m_thread;
     };
 
 } // namespace blink