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 57 matching lines @@
   virtual void AfterTest() OVERRIDE {}
 
  private:
   int num_commits_;
 };
 
 MULTI_THREAD_TEST_F(
     LayerTreeHostAnimationTestSetNeedsAnimateShouldNotSetCommitRequested);
 
 // Trigger a frame with SetNeedsCommit. Then, inside the resulting animate
-// callback, requet another frame using SetNeedsAnimate. End the test when
+// callback, request another frame using SetNeedsAnimate. End the test when
 // animate gets called yet-again, indicating that the proxy is correctly
-// handling the case where SetNeedsAnimate() is called inside the begin frame
+// handling the case where SetNeedsAnimate() is called inside the BeginFrame
 // flow.
 class LayerTreeHostAnimationTestSetNeedsAnimateInsideAnimationCallback
     : public LayerTreeHostAnimationTest {
  public:
   LayerTreeHostAnimationTestSetNeedsAnimateInsideAnimationCallback()
       : num_animates_(0) {}
 
   virtual void BeginTest() OVERRIDE {
     PostSetNeedsCommitToMainThread();
   }
@@ skipping 663 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 28 matching lines @@
   int finished_times_;
   FakeContentLayerClient client_;
   scoped_refptr<FakeContentLayer> content_;
 };
 
 MULTI_THREAD_TEST_F(
     LayerTreeHostAnimationTestCheckerboardDoesntStartAnimations);
 
 }  // namespace
 }  // namespace cc