cc:: Change plumbing for external_begin_frame_source to the Scheduler.

cc/trees/proxy_main.h

 // Copyright 2015 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_MAIN_H_
 #define CC_TREES_PROXY_MAIN_H_
 
 #include "base/macros.h"
 #include "cc/animation/animation_events.h"
 #include "cc/base/cc_export.h"
@@ skipping 10 matching lines @@
 class ChannelMain;
 class LayerTreeHost;
 
 // This class aggregates all interactions that the impl side of the compositor
 // needs to have with the main side.
 // The class is created and lives on the main thread.
 class CC_EXPORT ProxyMain : public Proxy {
  public:
   static scoped_ptr<ProxyMain> CreateThreaded(
       LayerTreeHost* layer_tree_host,
-      TaskRunnerProvider* task_runner_provider,
-      scoped_ptr<BeginFrameSource> external_begin_frame_source);
+      TaskRunnerProvider* task_runner_provider);
 
   ~ProxyMain() override;
 
   // Commits between the main and impl threads are processed through a pipeline
   // with the following stages. For efficiency we can early out at any stage if
   // we decide that no further processing is necessary.
   enum CommitPipelineStage {
     NO_PIPELINE_STAGE,
     ANIMATE_PIPELINE_STAGE,
     UPDATE_LAYERS_PIPELINE_STAGE,
@@ skipping 25 matching lines @@
   }
   CommitPipelineStage current_pipeline_stage() const {
     return current_pipeline_stage_;
   }
   CommitPipelineStage final_pipeline_stage() const {
     return final_pipeline_stage_;
   }
 
  protected:
   ProxyMain(LayerTreeHost* layer_tree_host,
-            TaskRunnerProvider* task_runner_provider,
-            scoped_ptr<BeginFrameSource> external_begin_frame_source);
+            TaskRunnerProvider* task_runner_provider);
 
  private:
   friend class ProxyMainForTest;
 
   // Proxy implementation.
   void FinishAllRendering() override;
   bool IsStarted() const override;
   bool CommitToActiveTree() const override;
   void SetOutputSurface(OutputSurface* output_surface) override;
   void SetVisible(bool visible) override;
   void SetThrottleFrameProduction(bool throttle) override;
   const RendererCapabilities& GetRendererCapabilities() const override;
   void SetNeedsAnimate() override;
   void SetNeedsUpdateLayers() override;
   void SetNeedsCommit() override;
   void SetNeedsRedraw(const gfx::Rect& damage_rect) override;
   void SetNextCommitWaitsForActivation() override;
   void NotifyInputThrottledUntilCommit() override;
   void SetDeferCommits(bool defer_commits) override;
   bool CommitRequested() const override;
   bool BeginMainFrameRequested() const override;
   void MainThreadHasStoppedFlinging() override;
-  void Start() override;
+  void Start(scoped_ptr<BeginFrameSource> external_begin_frame_source) override;
   void Stop() override;
   bool SupportsImplScrolling() const override;
   bool MainFrameWillHappenForTesting() override;
   void SetChildrenNeedBeginFrames(bool children_need_begin_frames) override;
   void SetAuthoritativeVSyncInterval(const base::TimeDelta& interval) override;
   void ReleaseOutputSurface() override;
   void UpdateTopControlsState(TopControlsState constraints,
                               TopControlsState current,
                               bool animate) override;
 
@@ skipping 25 matching lines @@
   bool commit_waits_for_activation_;
 
   // Set when the Proxy is started using Proxy::Start() and reset when it is
   // stopped using Proxy::Stop().
   bool started_;
 
   bool defer_commits_;
 
   RendererCapabilities renderer_capabilities_;
 
-  // This holds a valid value only until ProxyImpl is created on the impl thread
-  // with InitializeImplOnImpl().
-  // TODO(khushalsagar): Remove the use of this temporary variable.
-  // See crbug/567930.
-  scoped_ptr<BeginFrameSource> external_begin_frame_source_;
-
   scoped_ptr<ChannelMain> channel_main_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyMain);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROXY_MAIN_H_