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 40a054f119ba50154ec4d08a6bfc175342bdc535..08778f33d0f853929a839eac45dbacd82daac0af 100644
--- a/cc/scheduler/scheduler_state_machine.h
+++ b/cc/scheduler/scheduler_state_machine.h
@@ -108,6 +108,7 @@ class CC_EXPORT SchedulerStateMachine {
 
   enum Action {
     ACTION_NONE,
+    ACTION_ANIMATE,
     ACTION_SEND_BEGIN_MAIN_FRAME,
     ACTION_COMMIT,
     ACTION_UPDATE_VISIBLE_TILES,
@@ -172,6 +173,9 @@ 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();
@@ -254,6 +258,7 @@ class CC_EXPORT SchedulerStateMachine {
   // 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;
@@ -288,6 +293,7 @@ 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 manage_tiles_funnel_;
   int consecutive_checkerboard_animations_;
   bool needs_redraw_;
+  bool needs_animate_;
   bool needs_manage_tiles_;
   bool swap_used_incomplete_tile_;
   bool needs_commit_;