Expose Web Animations API to Web Workers

Source/core/workers/WorkerMessagingProxy.h

Index: Source/core/workers/WorkerMessagingProxy.h
diff --git a/Source/core/workers/WorkerMessagingProxy.h b/Source/core/workers/WorkerMessagingProxy.h
index 0babd10fe7b66c128dde2f0886db8ebd75513892..d82a8a2b1d52ff1e122969367614dca3f93f851b 100644
--- a/Source/core/workers/WorkerMessagingProxy.h
+++ b/Source/core/workers/WorkerMessagingProxy.h
@@ -28,6 +28,8 @@
 #define WorkerMessagingProxy_h
 
 #include "core/dom/ExecutionContext.h"
+#include "core/workers/DedicatedWorkerThread.h"
+#include "core/workers/WorkerGlobalScope.h"
 #include "core/workers/WorkerGlobalScopeProxy.h"
 #include "core/workers/WorkerLoaderProxy.h"
 #include "wtf/Forward.h"
@@ -40,7 +42,6 @@
 namespace blink {
 
 class WorkerObjectProxy;
-class DedicatedWorkerThread;
 class ExecutionContext;
 class Worker;
 class WorkerClients;
@@ -79,19 +80,17 @@ public:
     virtual bool postTaskToWorkerGlobalScope(PassOwnPtr<ExecutionContextTask>) OVERRIDE;
 
     void workerThreadCreated(PassRefPtr<DedicatedWorkerThread>);
-
+    WorkerGlobalScope* extractWorkerGlobalScope();
 protected:
     virtual ~WorkerMessagingProxy();
 
 private:
     static void workerObjectDestroyedInternal(ExecutionContext*, WorkerMessagingProxy*);
-
     RefPtrWillBePersistent<ExecutionContext> m_executionContext;
     OwnPtr<WorkerObjectProxy> m_workerObjectProxy;
     Worker* m_workerObject;
     bool m_mayBeDestroyed;
     RefPtr<DedicatedWorkerThread> m_workerThread;
-
     unsigned m_unconfirmedMessageCount; // Unconfirmed messages from worker object to worker thread.
     bool m_workerThreadHadPendingActivity; // The latest confirmation from worker thread reported that it was still active.