cc: Make separate interface for BeginFrame ipc from OutputSurface

content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.h

Index: content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.h
diff --git a/content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.h b/content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.h
new file mode 100644
index 0000000000000000000000000000000000000000..7324bf5bbf36e841886c0a48fd8db4e19fb44994
--- /dev/null
+++ b/content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.h
@@ -0,0 +1,44 @@
+// Copyright 2014 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_BROWSER_ANDROID_IN_PROCESS_SYNCHRONOUS_COMPOSITOR_EXTERNAL_BEGIN_FRAME_SOURCE_
+#define CONTENT_BROWSER_ANDROID_IN_PROCESS_SYNCHRONOUS_COMPOSITOR_EXTERNAL_BEGIN_FRAME_SOURCE_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "cc/scheduler/begin_frame_source.h"
+
+namespace content {
+class SynchronousCompositorImpl;
+
+// Make sure that this is initialized and set to compositor before output
+// surface is bound to compositor.
+class SynchronousCompositorExternalBeginFrameSource
+    : public cc::BeginFrameSourceMixIn {
+ public:
+  explicit SynchronousCompositorExternalBeginFrameSource(int routing_id);
+  virtual ~SynchronousCompositorExternalBeginFrameSource();
+
+  void BeginFrame();
+
+  void SetCompositor(SynchronousCompositorImpl* compositor);
+
+  // cc::BeginFrameSourceMixIn implementation.
+  void OnNeedsBeginFramesChange(bool needs_begin_frames) override;
+  void SetClientReady() override;
+
+ private:
+  int routing_id_;
+
+  // Not owned. This can be null when compositor is gone first than BFS.
+  SynchronousCompositorImpl* compositor_;
+
+  bool CalledOnValidThread() const;
+
+  DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorExternalBeginFrameSource);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_ANDROID_IN_PROCESS_SYNCHRONOUS_COMPOSITOR_EXTERNAL_BEGIN_FRAME_SOURCE_