Introduce WorkletGlobalScopeProxy interface.

third_party/WebKit/Source/modules/worklet/WorkletThread.h

+// 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 WorkletThread_h
+#define WorkletThread_h
+
+#include "core/dom/ExecutionContextTask.h"
+#include "platform/heap/Handle.h"
+#include "platform/weborigin/KURL.h"
+#include "wtf/Forward.h"
+#include "wtf/Functional.h"
+#include "wtf/ThreadingPrimitives.h"
+#include "wtf/text/WTFString.h"
+#include <v8.h>
+
+namespace blink {
+
+class SecurityOrigin;
+class WebTraceLocation;
+class WorkerBackingThread;
+class WorkletGlobalScope;
+class WorkletThreadStartupData;
+
+class WorkletThread {
+public:
+    virtual ~WorkletThread();
+
+    // Called on the main thread.
+    void initialize(PassOwnPtr<WorkletThreadStartupData>);
+    void terminate();
+
+    virtual WorkerBackingThread& workerBackingThread() = 0;
+    v8::Isolate* isolate();
+
+    bool isCurrentThread();
+
+    void postTask(const WebTraceLocation&, std::unique_ptr<ExecutionContextTask>);
+
+    // Can be called only on the worklet thread, WorkletGlobalScope is not thread
+    // safe.
+    WorkletGlobalScope* workletGlobalScope();
+
+protected:
+    WorkletThread();/*WorkletReportingProxy&*/
+
+    // Factory method for creating a new worklet context for the thread.
+    // Called on the worklet thread.
+    virtual WorkletGlobalScope* createWorkletGlobalScope(const KURL&, const String& userAgent, PassRefPtr<SecurityOrigin>) = 0;
+
+private:
+    // Called on the worklet thread.
+    void initializeInternal(PassOwnPtr<WorkletThreadStartupData>);
+    void terminateInternal();
+
+    std::unique_ptr<CrossThreadClosure> createWorkletThreadTask(std::unique_ptr<ExecutionContextTask>, bool isInstrumented);
+    void performTask(std::unique_ptr<ExecutionContextTask>, bool isInstrumented);
+
+    bool m_terminated;
+    bool m_shutdown;
+
+    // TODO figure out reporting proxy.
+    // WorkerReportingProxy& m_workerReportingProxy;
+
+    Mutex m_threadStateMutex;
+
+    Persistent<WorkletGlobalScope> m_workletGlobalScope;
+};
+
+} // namespace blink
+
+#endif // WorkletThread_h