cc: Add SetChildrenNeedBeginFrames() & SendBeginFramesToChildren()

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 230 matching lines @@
   void SetImplLatencyTakesPriorityOnBattery(
       bool impl_latency_takes_priority_on_battery) {
     impl_latency_takes_priority_on_battery_ =
         impl_latency_takes_priority_on_battery;
   }
 
   // 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_;
+  }
+
  protected:
   bool BeginFrameNeededToAnimateOrDraw() const;
+  bool BeginFrameNeededForChildren() const;
   bool ProactiveBeginFrameWanted() const;
 
   // True if we need to force activations to make forward progress.
   bool PendingActivationsShouldBeForced() const;
 
   bool ShouldAnimate() const;
   bool ShouldBeginOutputSurfaceCreation() const;
   bool ShouldDrawForced() const;
   bool ShouldDraw() const;
   bool ShouldActivatePendingTree() const;
@@ skipping 51 matching lines @@
   bool has_pending_tree_;
   bool pending_tree_is_ready_for_activation_;
   bool active_tree_needs_first_draw_;
   bool did_commit_after_animating_;
   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 impl_latency_takes_priority_on_battery_;
+  bool children_need_begin_frames_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SchedulerStateMachine);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_