Use DwmGetCompositionTimingInfo to get vsync info on Windows

ui/surface/accelerated_surface_win.h

 // 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.
 
 #ifndef UI_SURFACE_ACCELERATED_SURFACE_WIN_H_
 #define UI_SURFACE_ACCELERATED_SURFACE_WIN_H_
 
 #include <d3d9.h>
 
 #include "base/callback_forward.h"
@@ skipping 59 matching lines @@
   // presenter has affinity.
   void DoPresentAndAcknowledge(
       const gfx::Size& size,
       int64 surface_handle,
       const base::Callback<void(bool)>& completion_task);
   void DoSuspend();
   void DoPresent(HDC dc, bool* presented);
   bool DoRealPresent(HDC dc);
   void DoReleaseSurface();
 
+  // This gets the timestamp and period of the display's last vsync.
+  // The period is represented as a ratio which, when divided, will give you
+  // the interval in seconds. i.e.:
+  // inteval_in_seconds = interval_numerator / interval_denominator;
+  // For example, some machines will return an interval_numerator of 1001
+  // and an interval_denominator of 60000, resulting in an interval of
+  // 1001/60000 ~= .016683 seconds
+  // Note: This function assumes lock_ is acquired.
+  void GetPresentationStats(base::TimeTicks* timebase,
+                            uint32* interval_numerator,
+                            uint32* interval_denominator);
+
   // The thread with which this presenter has affinity.
   PresentThread* const present_thread_;
 
   // The window that is presented to.
   gfx::NativeWindow window_;
 
   // The lock is taken while any thread is calling the object, except those that
   // simply post from the main thread to the present thread via the immutable
   // present_thread_ member.
   base::Lock lock_;
@@ skipping 47 matching lines @@
 
   // Indicates that the surface has become invisible.
   void WasHidden();
 
  private:
   const scoped_refptr<AcceleratedPresenter> presenter_;
   DISALLOW_COPY_AND_ASSIGN(AcceleratedSurface);
 };
 
 #endif  // UI_SURFACE_ACCELERATED_SURFACE_WIN_H_