cc: Rename VSync to BeginFrame

cc/trees/layer_tree_host_unittest_animation.cc

 // Copyright 2012 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.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include "cc/animation/animation_curve.h"
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/animation/timing_function.h"
 #include "cc/layers/layer.h"
@@ skipping 743 matching lines @@
     if (TestEnded())
       return result;
     // Act like there is checkerboard when the second animation wants to draw.
     ++prevented_draw_;
     return false;
   }
 
   virtual void DidCommitAndDrawFrame() OVERRIDE {
     switch (layer_tree_host()->commit_number()) {
       case 1:
-        // The animation is longer than 1 vsync.
+        // The animation is longer than 1 BeginFrame interval.
         AddOpacityTransitionToLayer(content_, 0.1, 0.2f, 0.8f, false);
         added_animations_++;
         break;
       case 2:
         // This second animation will not be drawn so it should not start.
         AddAnimatedTransformToLayer(content_, 0.1, 5, 5);
         added_animations_++;
         break;
     }
   }
@@ skipping 92 matching lines @@
   FakeContentLayerClient client_;
   scoped_refptr<FakeContentLayer> root_layer_;
   int started_times_;
   int num_commit_complete_;
 };
 
 SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostAnimationTestPinchZoomScrollbars);
 
 }  // namespace
 }  // namespace cc