Introduce WorkletGlobalScopeProxy interface.

third_party/WebKit/Source/modules/compositorworker/CompositorWorkletThread.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/CompositorWorkletThread.h"
+
+#include "core/workers/WorkerBackingThread.h"
+#include "modules/compositorworker/CompositorWorkletGlobalScope.h"
+#include "modules/worklet/WorkletThreadStartupData.h"
+#include "platform/weborigin/SecurityOrigin.h"
+#include "public/platform/Platform.h"
+
+namespace blink {
+
+namespace {
+
+// This is a singleton class holding the compositor worker thread in this
+// renderrer process. BackingThreadHolst::m_thread will never be cleared,
+// but Oilpan and V8 are detached from the thread when the last compositor
+// worker thread is gone.
+// See WorkerThread::terminateAndWaitForAllWorkers for the process shutdown
+// case.
+class BackingThreadHolder {
+public:
+    static BackingThreadHolder& instance()
+    {
+        DEFINE_THREAD_SAFE_STATIC_LOCAL(BackingThreadHolder, holder, new BackingThreadHolder);
+        return holder;
+    }
+
+    WorkerBackingThread* thread() { return m_thread.get(); }
+
+private:
+    BackingThreadHolder() : m_thread(WorkerBackingThread::create(Platform::current()->compositorThread())) {}
+
+    OwnPtr<WorkerBackingThread> m_thread;
+};
+
+} // namespace
+
+PassOwnPtr<CompositorWorkletThread> CompositorWorkletThread::create(const KURL& url, const String& userAgent, PassRefPtr<SecurityOrigin> securityOrigin)
+{
+    CompositorWorkletThread* workletThread = new CompositorWorkletThread();
+    workletThread->initialize(WorkletThreadStartupData::create(url, userAgent, securityOrigin->isolatedCopy()));
+    return adoptPtr(workletThread);
+}
+
+
+CompositorWorkletThread::CompositorWorkletThread()
+{
+}
+
+CompositorWorkletThread::~CompositorWorkletThread()
+{
+}
+
+WorkerBackingThread& CompositorWorkletThread::workerBackingThread()
+{
+    return *BackingThreadHolder::instance().thread();
+}
+
+WorkletGlobalScope* CompositorWorkletThread::createWorkletGlobalScope(const KURL& url, const String& userAgent, PassRefPtr<SecurityOrigin> securityOrigin)
+{
+    return CompositorWorkletGlobalScope::create(url, userAgent, securityOrigin, workerBackingThread().isolate());
+}
+
+} // namespace blink