cc:: Change plumbing for external_begin_frame_source to the Scheduler.

cc/trees/proxy.h

 // Copyright 2011 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 CC_TREES_PROXY_H_
 #define CC_TREES_PROXY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "cc/base/cc_export.h"
 #include "cc/input/top_controls_state.h"
+#include "cc/scheduler/begin_frame_source.h"
 #include "cc/trees/task_runner_provider.h"
 
 namespace gfx {
 class Rect;
 class Vector2d;
 }
 
 namespace cc {
+class BeginFrameSource;
 class LayerTreeDebugState;
 class OutputSurface;
 struct RendererCapabilities;
 
 // Abstract interface responsible for proxying commands from the main-thread
 // side of the compositor over to the compositor implementation.
 class CC_EXPORT Proxy {
  public:
   virtual ~Proxy() {}
 
@@ skipping 25 matching lines @@
   // Defers commits until it is reset. It is only supported when using a
   // scheduler.
   virtual void SetDeferCommits(bool defer_commits) = 0;
 
   virtual void MainThreadHasStoppedFlinging() = 0;
 
   virtual bool CommitRequested() const = 0;
   virtual bool BeginMainFrameRequested() const = 0;
 
   // Must be called before using the proxy.
-  virtual void Start() = 0;
+  virtual void Start(
+      scoped_ptr<BeginFrameSource> external_begin_frame_source) = 0;
   virtual void Stop() = 0;   // Must be called before deleting the proxy.
 
   virtual bool SupportsImplScrolling() const = 0;
 
   virtual void SetChildrenNeedBeginFrames(bool children_need_begin_frames) = 0;
 
   virtual void SetAuthoritativeVSyncInterval(
       const base::TimeDelta& interval) = 0;
 
   virtual void UpdateTopControlsState(TopControlsState constraints,
                                       TopControlsState current,
                                       bool animate) = 0;
 
   // Testing hooks
   virtual bool MainFrameWillHappenForTesting() = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROXY_H_