Introduce WorkletGlobalScopeProxy interface.

third_party/WebKit/Source/modules/worklet/ThreadedWorkletGlobalScope.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/worklet/ThreadedWorkletGlobalScope.h"
+
+#include "platform/weborigin/SecurityOrigin.h"
+#include "wtf/PassRefPtr.h"
+
+namespace blink {
+
+ThreadedWorkletGlobalScope::ThreadedWorkletGlobalScope(const KURL& url, const String& userAgent, PassRefPtr<SecurityOrigin> securityOrigin, v8::Isolate* isolate)
+    : WorkletGlobalScope(url, userAgent, securityOrigin, isolate)
+{
+}
+
+ThreadedWorkletGlobalScope::~ThreadedWorkletGlobalScope()
+{
+}
+
+void ThreadedWorkletGlobalScope::addConsoleMessage(ConsoleMessage* consoleMessage)
+{
+    // TODO need back communication.
+}
+
+} // namespace blink