cc: Rename VSync to BeginFrame

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 fb3908b71ced9af5ad0bcfe58e360e75377a3abf..5c1b03be9cc2d4d3ffaca57125858330c903e353 100644
--- a/cc/scheduler/scheduler_state_machine.h
+++ b/cc/scheduler/scheduler_state_machine.h
@@ -70,14 +70,14 @@ class CC_EXPORT SchedulerStateMachine {
   Action NextAction() const;
   void UpdateState(Action action);
 
-  // Indicates whether the scheduler needs a vsync callback in order to make
-  // progress.
-  bool VSyncCallbackNeeded() const;
+  // Indicates whether the scheduler needs a BeginFrame callback in order to
+  // make progress.
+  bool BeginFrameCallbackNeeded() const;
 
-  // Indicates that the system has entered and left a vsync callback.
-  // The scheduler will not draw more than once in a given vsync callback.
-  void DidEnterVSync();
-  void DidLeaveVSync();
+  // Indicates that the system has entered and left a BeginFrame callback.
+  // The scheduler will not draw more than once in a given BeginFrame callback.
+  void DidEnterBeginFrame();
+  void DidLeaveBeginFrame();
 
   // Indicates whether the LayerTreeHostImpl is visible.
   void SetVisible(bool visible);
@@ -180,7 +180,7 @@ class CC_EXPORT SchedulerStateMachine {
   bool needs_forced_commit_;
   bool expect_immediate_begin_frame_;
   bool main_thread_needs_layer_textures_;
-  bool inside_vsync_;
+  bool inside_begin_frame_;
   bool visible_;
   bool can_start_;
   bool can_draw_;