cc: Add SetNeedsOneBeginImplFrame to the Scheduler

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 189 matching lines @@
 
   // Indicates whether ACTION_DRAW_AND_SWAP_IF_POSSIBLE drew to the screen.
   void DidDrawIfPossibleCompleted(DrawResult result);
 
   // Indicates that a new begin main frame flow needs to be performed, either
   // to pull updates from the main thread to the impl, or to push deltas from
   // the impl thread to main.
   void SetNeedsBeginMainFrame();
   bool needs_begin_main_frame() const { return needs_begin_main_frame_; }
 
+  // Requests a single impl frame (after the current frame if there is one
+  // active).
+  void SetNeedsOneBeginImplFrame();
+
   // Call this only in response to receiving an ACTION_SEND_BEGIN_MAIN_FRAME
   // from NextAction.
   // Indicates that all painting is complete.
   void NotifyReadyToCommit();
 
   // Call this only in response to receiving an ACTION_SEND_BEGIN_MAIN_FRAME
   // from NextAction if the client rejects the BeginMainFrame message.
   void BeginMainFrameAborted(CommitEarlyOutReason reason);
 
   // Indicates production should be skipped to recover latency.
@@ skipping 94 matching lines @@
   int prepare_tiles_funnel_;
 
   int consecutive_checkerboard_animations_;
   int max_pending_swaps_;
   int pending_swaps_;
   int swaps_with_current_output_surface_;
   bool needs_redraw_;
   bool needs_animate_;
   bool needs_prepare_tiles_;
   bool needs_begin_main_frame_;
+  bool needs_one_begin_impl_frame_;
   bool visible_;
   bool resourceless_draw_;
   bool can_draw_;
   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 main_thread_missed_last_deadline_;
   bool skip_next_begin_main_frame_to_reduce_latency_;
   bool children_need_begin_frames_;
   bool defer_commits_;
   bool video_needs_begin_frames_;
   bool last_commit_had_no_updates_;
   bool wait_for_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_