Introduce WorkletGlobalScopeProxy interface.

third_party/WebKit/Source/modules/compositorworker/CompositorWorkletGlobalScope.cpp

+// 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.
+
+#include "modules/compositorworker/CompositorWorkletGlobalScope.h"
+
+#include "platform/weborigin/SecurityOrigin.h"
+
+namespace blink {
+
+CompositorWorkletGlobalScope* CompositorWorkletGlobalScope::create(const KURL& url, const String& userAgent, PassRefPtr<SecurityOrigin> securityOrigin, v8::Isolate* isolate)
+{
+    return new CompositorWorkletGlobalScope(url, userAgent, securityOrigin, isolate);
+}
+
+CompositorWorkletGlobalScope::CompositorWorkletGlobalScope(const KURL& url, const String& userAgent, PassRefPtr<SecurityOrigin> securityOrigin, v8::Isolate* isolate)
+    : ThreadedWorkletGlobalScope(url, userAgent, securityOrigin, isolate)
+{
+}
+
+CompositorWorkletGlobalScope::~CompositorWorkletGlobalScope()
+{
+}
+
+} // namespace blink