[Do not submit] Worklet implementation.

third_party/WebKit/Source/modules/worklet/CompositorWorkletThread.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 CompositorWorkletThread_h
+#define CompositorWorkletThread_h
+
+#include "platform/WebThreadSupportingGC.h"
+#include "platform/heap/Handle.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+class WorkletGlobalScope;
+
+class CompositorWorkletThread : public RefCounted<CompositorWorkletThread> {
+public:
+    static PassRefPtr<CompositorWorkletThread> create();
+    virtual ~CompositorWorkletThread();
+
+    void initialize();
+    void loadScript(const String& sourceCode);
+
+    v8::Isolate* isolate() const { return m_isolate; }
+
+private:
+    CompositorWorkletThread();
+
+    WebThreadSupportingGC& backingThread();
+    void initializeInternal();
+    void loadScriptInternal(const String& sourceCode);
+
+    OwnPtr<WebThread::TaskObserver> m_microtaskRunner;
+
+    bool m_initialized = false;
+    Mutex m_threadStateMutex;
+
+    RefPtrWillBePersistent<WorkletGlobalScope> m_workletGlobalScope;
+    v8::Isolate* m_isolate;
+};
+
+} // namespace blink
+
+#endif // CompositorWorkletThread_h