cc: Cleanup DelayBasedTimeSource code.

cc/scheduler/begin_frame_source.h

 // 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 CC_SCHEDULER_BEGIN_FRAME_SOURCE_H_
 #define CC_SCHEDULER_BEGIN_FRAME_SOURCE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 207 matching lines @@
                                base::TimeDelta new_vsync_interval);
 
   // Tracing
   void AsValueInto(base::trace_event::TracedValue* dict) const override;
 
   // TimeSourceClient
   void OnTimerTick() override;
 
  protected:
   explicit SyntheticBeginFrameSource(
+      base::SingleThreadTaskRunner* task_runner,
       scoped_ptr<DelayBasedTimeSource> time_source);
 
   BeginFrameArgs CreateBeginFrameArgs(base::TimeTicks frame_time,
                                       BeginFrameArgs::BeginFrameArgsType type);
 
   // BeginFrameSourceBase
   void OnNeedsBeginFramesChange(bool needs_begin_frames) override;
 
+  base::SingleThreadTaskRunner* task_runner_;
   scoped_ptr<DelayBasedTimeSource> time_source_;
 
  private:
+  base::WeakPtrFactory<SyntheticBeginFrameSource> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(SyntheticBeginFrameSource);
 };
 
 // A "virtual" frame source which lets you switch between multiple other frame
 // sources while making sure the BeginFrameArgs stays increasing (possibly
 // enforcing minimum boundry between BeginFrameArgs messages).
 class CC_EXPORT BeginFrameSourceMultiplexer : public BeginFrameSourceBase,
                                               public BeginFrameObserver {
  public:
   static scoped_ptr<BeginFrameSourceMultiplexer> Create();
@@ skipping 34 matching lines @@
   BeginFrameSource* active_source_;
   std::set<BeginFrameSource*> source_list_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BeginFrameSourceMultiplexer);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_BEGIN_FRAME_SOURCE_H_