cc: Remove background ticking from LTHI.

cc/scheduler/scheduler.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_SCHEDULER_SCHEDULER_H_
 #define CC_SCHEDULER_SCHEDULER_H_
 
 #include <deque>
 #include <string>
 
@@ skipping 44 matching lines @@
 
 class Scheduler;
 // This class exists to allow tests to override the frame source construction.
 // A virtual method can't be used as this needs to happen in the constructor
 // (see C++ FAQ / Section 23 - http://goo.gl/fnrwom for why).
 // This class exists solely long enough to construct the frame sources.
 class CC_EXPORT SchedulerFrameSourcesConstructor {
  public:
   virtual ~SchedulerFrameSourcesConstructor() {}
   virtual BeginFrameSource* ConstructPrimaryFrameSource(Scheduler* scheduler);
-  virtual BeginFrameSource* ConstructBackgroundFrameSource(
-      Scheduler* scheduler);
   virtual BeginFrameSource* ConstructUnthrottledFrameSource(
       Scheduler* scheduler);
 
  protected:
   SchedulerFrameSourcesConstructor() {}
 
   friend class Scheduler;
 };
 
 class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
@@ skipping 98 matching lines @@
             const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
             scoped_ptr<BeginFrameSource> external_begin_frame_source,
             SchedulerFrameSourcesConstructor* frame_sources_constructor);
 
   // virtual for testing - Don't call these in the constructor or
   // destructor!
   virtual base::TimeTicks Now() const;
 
   scoped_ptr<BeginFrameSourceMultiplexer> frame_source_;
   BeginFrameSource* primary_frame_source_;
-  BeginFrameSource* background_frame_source_;
   BeginFrameSource* unthrottled_frame_source_;
 
   // Storage when frame sources are internal
   scoped_ptr<BeginFrameSource> primary_frame_source_internal_;
-  scoped_ptr<SyntheticBeginFrameSource> background_frame_source_internal_;
   scoped_ptr<BeginFrameSource> unthrottled_frame_source_internal_;
 
   VSyncParameterObserver* vsync_observer_;
   base::TimeDelta authoritative_vsync_interval_;
   base::TimeTicks last_vsync_timebase_;
 
   bool throttle_frame_production_;
 
   const SchedulerSettings settings_;
   SchedulerClient* client_;
@@ skipping 50 matching lines @@
 
   friend class SchedulerFrameSourcesConstructor;
   friend class TestSchedulerFrameSourcesConstructor;
 
   DISALLOW_COPY_AND_ASSIGN(Scheduler);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_H_