cc: Add support for sending BeginFrames for video.

cc/scheduler/scheduler_state_machine.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_STATE_MACHINE_H_
 #define CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 236 matching lines @@
 
   // TODO(zmo): This is temporary for debugging crbug.com/393331.
   // We should remove it afterwards.
   std::string GetStatesForDebugging() const;
 
   void SetChildrenNeedBeginFrames(bool children_need_begin_frames);
   bool children_need_begin_frames() const {
     return children_need_begin_frames_;
   }
 
+  bool video_needs_begin_frames() const { return video_needs_begin_frames_; }

[brianderson, 2015/04/16 01:42:23]

Accesser below setter for consistency?

[sunnyps, 2015/04/16 20:56:11]

Done.

+  void SetVideoNeedsBeginFrames(bool video_needs_begin_frames);
+
  protected:
   bool BeginFrameRequiredForAction() const;
   bool BeginFrameRequiredForChildren() const;
+  bool BeginFrameNeededForVideo() const;
   bool ProactiveBeginFrameWanted() const;
 
   bool ShouldTriggerBeginImplFrameDeadlineImmediately() const;
 
   // True if we need to force activations to make forward progress.
   bool PendingActivationsShouldBeForced() const;
 
   bool ShouldAnimate() const;
   bool ShouldBeginOutputSurfaceCreation() const;
   bool ShouldDraw() const;
@@ skipping 53 matching lines @@
   bool has_pending_tree_;
   bool pending_tree_is_ready_for_activation_;
   bool active_tree_needs_first_draw_;
   bool did_create_and_initialize_first_output_surface_;
   bool impl_latency_takes_priority_;
   bool skip_next_begin_main_frame_to_reduce_latency_;
   bool skip_begin_main_frame_to_reduce_latency_;
   bool continuous_painting_;
   bool children_need_begin_frames_;
   bool defer_commits_;
+  bool video_needs_begin_frames_;
   bool last_commit_had_no_updates_;
   bool wait_for_active_tree_ready_to_draw_;
   bool did_request_swap_in_last_frame_;
   bool did_perform_swap_in_last_draw_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SchedulerStateMachine);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_