[exp] cc: Introduce cc::CompositorMutator.

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 85 matching lines @@
            commit_state_ == COMMIT_STATE_READY_TO_COMMIT;
   }
   CommitState commit_state() const { return commit_state_; }
 
   bool RedrawPending() const { return needs_redraw_; }
   bool PrepareTilesPending() const { return needs_prepare_tiles_; }
 
   enum Action {
     ACTION_NONE,
     ACTION_ANIMATE,
+    ACTION_CUSTOM_MUTATE,
     ACTION_SEND_BEGIN_MAIN_FRAME,
     ACTION_COMMIT,
     ACTION_ACTIVATE_SYNC_TREE,
     ACTION_DRAW_AND_SWAP_IF_POSSIBLE,
     ACTION_DRAW_AND_SWAP_FORCED,
     ACTION_DRAW_AND_SWAP_ABORT,
     ACTION_BEGIN_OUTPUT_SURFACE_CREATION,
     ACTION_PREPARE_TILES,
   };
   static const char* ActionToString(Action action);
@@ skipping 49 matching lines @@
   bool visible() const { return visible_; }
 
   // Indicates that a redraw is required, either due to the impl tree changing
   // or the screen being damaged and simply needing redisplay.
   void SetNeedsRedraw();
   bool needs_redraw() const { return needs_redraw_; }
 
   void SetNeedsAnimate();
   bool needs_animate() const { return needs_animate_; }
 
+  void SetNeedsCustomMutate();
+  bool needs_custom_mutate() const { return needs_custom_mutate_; }
+
   // Indicates that prepare-tiles is required. This guarantees another
   // PrepareTiles will occur shortly (even if no redraw is required).
   void SetNeedsPrepareTiles();
 
   // Sets how many swaps can be pending to the OutputSurface.
   void SetMaxSwapsPending(int max);
 
   // If the scheduler attempted to draw and swap, this provides feedback
   // regarding whether or not the swap actually occured. We might skip the
   // swap when there is not damage, for example.
@@ skipping 84 matching lines @@
   bool BeginFrameNeededToAnimateOrDraw() const;
   bool BeginFrameNeededForChildren() 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 ShouldCustomMutate() const;
   bool ShouldBeginOutputSurfaceCreation() const;
   bool ShouldDraw() const;
   bool ShouldActivatePendingTree() const;
   bool ShouldSendBeginMainFrame() const;
   bool ShouldCommit() const;
   bool ShouldPrepareTiles() const;
 
   void AdvanceCurrentFrameNumber();
   bool HasAnimatedThisFrame() const;
+  bool HasCustomMutatedThisFrame() const;
   bool HasSentBeginMainFrameThisFrame() const;
   bool HasRequestedSwapThisFrame() const;
   bool HasSwappedThisFrame() const;
 
   void UpdateStateOnCommit(bool commit_had_no_updates);
   void UpdateStateOnActivation();
   void UpdateStateOnDraw(bool did_request_swap);
   void UpdateStateOnPrepareTiles();
 
   const SchedulerSettings settings_;
 
   OutputSurfaceState output_surface_state_;
   BeginImplFrameState begin_impl_frame_state_;
   CommitState commit_state_;
   ForcedRedrawOnTimeoutState forced_redraw_state_;
 
   BeginFrameArgs begin_impl_frame_args_;
 
   int commit_count_;
   int current_frame_number_;
   int last_frame_number_animate_performed_;
+  int last_frame_number_custom_mutate_performed_;
   int last_frame_number_swap_performed_;
   int last_frame_number_swap_requested_;
   int last_frame_number_begin_main_frame_sent_;
 
   // prepare_tiles_funnel_ is "filled" each time PrepareTiles is called
   // and "drained" on each BeginImplFrame. If the funnel gets too full,
   // we start throttling ACTION_PREPARE_TILES such that we average one
   // PrepareTiles per BeginImplFrame.
   int prepare_tiles_funnel_;
   int consecutive_checkerboard_animations_;
   int max_pending_swaps_;
   int pending_swaps_;
   bool needs_redraw_;
   bool needs_animate_;
+  bool needs_custom_mutate_;
   bool needs_prepare_tiles_;
   bool needs_commit_;
   bool inside_poll_for_anticipated_draw_triggers_;
   bool visible_;
   bool can_start_;
   bool can_draw_;
   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 children_need_begin_frames_;
   bool defer_commits_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SchedulerStateMachine);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_