[worklets] Introduce ThreadedWorkletMessagingProxy and AnimationWorkletMessagaingProxy.

third_party/WebKit/Source/core/workers/ThreadedWorkletObjectProxy.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 ThreadedWorkletObjectProxy_h
+#define ThreadedWorkletObjectProxy_h
+
+#include "bindings/core/v8/SourceLocation.h"
+#include "core/CoreExport.h"
+#include "core/dom/MessagePort.h"
+#include "core/workers/WorkerReportingProxy.h"
+
+namespace blink {
+
+class ConsoleMessage;
+class ExecutionContext;
+class ExecutionContextTask;
+class ThreadedWorkletMessagingProxy;
+
+// A proxy to talk to the parent worklet object. This object is created on the
+// main thread, passed on to the worklet thread, and used just to proxy
+// messages to the ThreadedWorkletMessagingProxy on the main thread.
+class CORE_EXPORT ThreadedWorkletObjectProxy : public WorkerReportingProxy {
+    USING_FAST_MALLOC(ThreadedWorkletObjectProxy);
+    WTF_MAKE_NONCOPYABLE(ThreadedWorkletObjectProxy);
+
+public:
+    static std::unique_ptr<ThreadedWorkletObjectProxy> create(ThreadedWorkletMessagingProxy*);
+    ~ThreadedWorkletObjectProxy() override {}
+
+    void postTaskToMainExecutionContext(std::unique_ptr<ExecutionContextTask>);
+    void reportPendingActivity(bool hasPendingActivity);
+
+    // WorkerReportingProxy overrides.
+    void reportException(const String& errorMessage, std::unique_ptr<SourceLocation>, int exceptionId) override {}
+    void reportConsoleMessage(MessageSource, MessageLevel, const String& message, SourceLocation*) override;
+    void postMessageToPageInspector(const String&) override;
+    void didEvaluateWorkerScript(bool success) override {}
+    void didCloseWorkerGlobalScope() override;
+    void willDestroyWorkerGlobalScope() override {}
+    void didTerminateWorkerThread() override;
+
+protected:
+    ThreadedWorkletObjectProxy(ThreadedWorkletMessagingProxy*);
+
+private:
+    ExecutionContext* getExecutionContext() const;
+
+    // This object always outlives this proxy.
+    ThreadedWorkletMessagingProxy* m_messagingProxy;
+};
+
+} // namespace blink
+
+#endif // ThreadedWorkletObjectProxy_h