Introduce WorkletGlobalScopeProxy interface.

third_party/WebKit/Source/modules/compositorworker/CompositorWorkerThread.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CompositorWorkerThread_h
 #define CompositorWorkerThread_h
 
 #include "core/workers/WorkerThread.h"
 #include "modules/ModulesExport.h"
 
@@ skipping 15 matching lines @@
     static void createSharedBackingThreadForTest();
 
     // This is called before CoreInitializer::shutdown as shutdown waits for
     // worker threads that can be blocked by scripts.
     static void terminateExecution();
     static void clearSharedBackingThread();
 
 protected:
     CompositorWorkerThread(PassRefPtr<WorkerLoaderProxy>, InProcessWorkerObjectProxy&, double timeOrigin);
 
-    WorkerGlobalScope* createWorkerGlobalScope(PassOwnPtr<WorkerThreadStartupData>) override;
+    WorkerGlobalScope* createWorkerGlobalScope(WorkerThreadStartupData*) override;
 
 private:
     InProcessWorkerObjectProxy& m_workerObjectProxy;
     double m_timeOrigin;
 };
 
 } // namespace blink
 
 #endif // CompositorWorkerThread_h