Introduce WorkletGlobalScopeProxy interface.

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

Index: third_party/WebKit/Source/modules/compositorworker/CompositorWorkletGlobalScopeProxy.h
diff --git a/third_party/WebKit/Source/modules/compositorworker/CompositorWorkletGlobalScopeProxy.h b/third_party/WebKit/Source/modules/compositorworker/CompositorWorkletGlobalScopeProxy.h
new file mode 100644
index 0000000000000000000000000000000000000000..616b46c1f125aefe07168c6bc11751faf683c058
--- /dev/null
+++ b/third_party/WebKit/Source/modules/compositorworker/CompositorWorkletGlobalScopeProxy.h
@@ -0,0 +1,28 @@
+// Copyright 2016 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 CompositorWorkletGlobalScopeProxy_h
+#define CompositorWorkletGlobalScopeProxy_h
+
+#include "modules/worklet/ThreadedWorkletGlobalScopeProxy.h"
+
+#include "platform/weborigin/SecurityOrigin.h"
+
+namespace blink {
+
+class CompositorWorkletGlobalScopeProxy final : public ThreadedWorkletGlobalScopeProxy {
+public:
+    static CompositorWorkletGlobalScopeProxy* create(const KURL& url, const String& userAgent, PassRefPtr<SecurityOrigin> securityOrigin)
+    {
+        return new CompositorWorkletGlobalScopeProxy(url, userAgent, securityOrigin);
+    }
+    ~CompositorWorkletGlobalScopeProxy() override;
+
+private:
+    CompositorWorkletGlobalScopeProxy(const KURL&, const String& userAgent, PassRefPtr<SecurityOrigin>);
+};
+
+} // namespace blink
+
+#endif // CompositorWorkletGlobalScopeProxy_h