Implement WebCompositorOutputSurface

content/renderer/gpu/compositor_output_surface.h

+// Copyright (c) 2012 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 CONTENT_RENDERER_GPU_COMPOSITOR_OUTPUT_SURFACE_H_
+#define CONTENT_RENDERER_GPU_COMPOSITOR_OUTPUT_SURFACE_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/ref_counted.h"
+#include "base/time.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebCompositorOutputSurface.h"
+
+namespace base {
+  class TaskRunner;
+}
+
+namespace IPC {
+  class ForwardingMessageFilter;
+  class Message;
+  class SyncChannel;
+}
+
+class CompositorOutputSurface : public WebKit::WebCompositorOutputSurface {

[piman, 2012/08/08 16:47:43]

Can we add a quick comment that this class is created on the main thread, but
called (and destroyed) from the compositor thread (if it's on)?
We could use base::NonThreadSafe, disconnecting from the thread in the
constructor, but checking in all entrypoints.

+ public:
+  static IPC::ForwardingMessageFilter* CreateFilter(
+      base::TaskRunner* target_task_runner);
+
+  CompositorOutputSurface(int32 routing_id,
+                          WebKit::WebGraphicsContext3D* context3d);
+  virtual ~CompositorOutputSurface();
+
+  // WebCompositorOutputSurface implementation.
+  virtual bool bindToClient(
+      WebKit::WebCompositorOutputSurfaceClient* client) OVERRIDE;
+  virtual const Capabilities& capabilities() const OVERRIDE;
+  virtual WebKit::WebGraphicsContext3D* context3D() const OVERRIDE;
+  virtual void sendFrameToParentCompositor(
+      const WebKit::WebCompositorFrame&) OVERRIDE;
+
+ private:
+  void OnMessageReceived(const IPC::Message& message);
+  void OnUpdateVSyncParameters(
+      base::TimeTicks timebase, base::TimeDelta interval);
+
+  scoped_refptr<IPC::ForwardingMessageFilter> output_surface_filter_;
+  WebKit::WebCompositorOutputSurfaceClient* client_;
+  int routing_id_;
+  Capabilities capabilities_;
+  scoped_ptr<WebKit::WebGraphicsContext3D> context3D_;
+};
+
+#endif  // CONTENT_RENDERER_GPU_COMPOSITOR_OUTPUT_SURFACE_H_
+