cc: Make animations tick regardless of drawing.

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 4c342afca414a830848276d8c886434e078cad50..55581a457232b46732f098f4a912712cb5331f81 100644
--- a/cc/scheduler/scheduler_state_machine.h
+++ b/cc/scheduler/scheduler_state_machine.h
@@ -144,11 +144,14 @@ class CC_EXPORT SchedulerStateMachine {
   // Exposed for testing purposes.
   void SetMaximumNumberOfFailedDrawsBeforeDrawIsForced(int num_draws);
 
+  // False if drawing is not being prevented, true if drawing won't happen
+  // for some reason, such as not being visible.
+  bool DrawSuspendedUntilCommit() const;
+
   std::string ToString();
 
  protected:
   bool ShouldDrawForced() const;
-  bool DrawSuspendedUntilCommit() const;
   bool ScheduledToDraw() const;
   bool ShouldDraw() const;
   bool ShouldAttemptTreeActivation() const;