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..0a0264dd00bf002fffb0b4e203133e92f821d566
--- /dev/null
+++ b/content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.h
@@ -0,0 +1,37 @@
+// 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;
+
+class SynchronousCompositorExternalBeginFrameSource
+    : public cc::BeginFrameSourceMixIn {
+ public:
+  explicit SynchronousCompositorExternalBeginFrameSource(
+      SynchronousCompositorImpl* compositor);
+  virtual ~SynchronousCompositorExternalBeginFrameSource();
+
+  void BeginFrame();
+
+  // cc::BeginFrameSourceMixIn implementation.
+  virtual void OnNeedsBeginFramesChange(bool needs_begin_frames) override;
+
+ private:
+  SynchronousCompositorImpl* compositor_;
+
+  bool CalledOnValidThread() const;
+
+  DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorExternalBeginFrameSource);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_ANDROID_IN_PROCESS_SYNCHRONOUS_COMPOSITOR_EXTERNAL_BEGIN_FRAME_SOURCE_