Read compositor VSync information from platform, when possible

ui/aura/bench/bench_main.cc

 // Copyright (c) 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 "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/i18n/icu_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 104 matching lines @@
     } else {
       Draw();
     }
   }
 
   virtual void OnCompositingAborted(Compositor* compositor) OVERRIDE {}
 
   virtual void OnCompositingLockStateChanged(
       Compositor* compositor) OVERRIDE {}
 
-  virtual void OnUpdateVSyncParameters(ui::Compositor* compositor,
-                                       base::TimeTicks timebase,
-                                       base::TimeDelta interval) OVERRIDE {
-  }
-
   virtual void Draw() {}
 
   int frames() const { return frames_; }
 
  private:
   TimeTicks start_time_;
   int frames_;
   int max_frames_;
 
   DISALLOW_COPY_AND_ASSIGN(BenchCompositorObserver);
@@ skipping 215 matching lines @@
   ui::PrintLayerHierarchy(root_window->window()->layer(), gfx::Point(100, 100));
 #endif
 
   root_window->host()->Show();
   base::MessageLoopForUI::current()->Run();
   focus_client.reset();
   root_window.reset();
 
   return 0;
 }