cc: Split animating and drawing into separate actions

cc/scheduler/scheduler_state_machine.h

Index: cc/scheduler/scheduler_state_machine.h
diff --git a/cc/scheduler/scheduler_state_machine.h b/cc/scheduler/scheduler_state_machine.h
index 277926471a3feaa4b4f6c7c7e1833ddcce5c0bd8..e7d05e62ab9b1c18f3ad14a5bf3f8b11881eb2bc 100644
--- a/cc/scheduler/scheduler_state_machine.h
+++ b/cc/scheduler/scheduler_state_machine.h
@@ -101,6 +101,7 @@ class CC_EXPORT SchedulerStateMachine {
 
   enum Action {
     ACTION_NONE,
+    ACTION_ANIMATE,
     ACTION_SEND_BEGIN_MAIN_FRAME,
     ACTION_COMMIT,
     ACTION_UPDATE_VISIBLE_TILES,
@@ -164,6 +165,9 @@ class CC_EXPORT SchedulerStateMachine {
   void SetNeedsRedraw();
   bool needs_redraw() const { return needs_redraw_; }
 
+  void SetNeedsAnimate();
+  bool needs_animate() const { return needs_animate_; }
+
   // Indicates that manage-tiles is required. This guarantees another
   // ManageTiles will occur shortly (even if no redraw is required).
   void SetNeedsManageTiles();
@@ -248,12 +252,13 @@ class CC_EXPORT SchedulerStateMachine {
   }
 
  protected:
-  bool BeginFrameNeededToDraw() const;
+  bool BeginFrameNeededToAnimateOrDraw() 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;
@@ -286,6 +291,7 @@ class CC_EXPORT SchedulerStateMachine {
 
   int commit_count_;
   int current_frame_number_;
+  int last_frame_number_animate_performed_;
   int last_frame_number_swap_performed_;
   int last_frame_number_begin_main_frame_sent_;
   int last_frame_number_update_visible_tiles_was_called_;
@@ -299,6 +305,7 @@ class CC_EXPORT SchedulerStateMachine {
   int max_pending_swaps_;
   int pending_swaps_;
   bool needs_redraw_;
+  bool needs_animate_;
   bool needs_manage_tiles_;
   bool swap_used_incomplete_tile_;
   bool needs_commit_;