Get high resolution frame timebase and interval on compatible systems

ui/gfx/frame_time.h

 // Copyright 2013 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_GFX_FRAME_TIME_H
 #define UI_GFX_FRAME_TIME_H
 
 #include "base/time/time.h"
 #include "base/logging.h"
 
@@ skipping 10 matching lines @@
   }
 
 #if defined(OS_WIN)
   static base::TimeTicks FromQPCValue(LONGLONG qpc_value) {
     DCHECK(TimestampsAreHighRes());
     return base::TimeTicks::FromQPCValue(qpc_value);
   }
 #endif
 
   static bool TimestampsAreHighRes() {
-    // This should really return base::TimeTicks::IsHighResNowFastAndReliable();
-    // Returning false makes sure we are only using low-res timestamps until we
-    // use FrameTime everywhere we need to. See crbug.com/315334

[brianderson, 2014/10/22 23:05:29]

Note: This comment is a bit missleading. "until we use FrameTime everywhere"
should read "until we use the same timebase everywhere".

IsHighResClockWorking being true means that Now() is equivalent to HighResNow()
now, so we shouldn't have the timebase mismatch issues that we were having
before.

-    return false;
+    return base::TimeTicks::IsHighResClockWorking();
   }
 };
 
 }
 
 #endif // UI_GFX_FRAME_TIME_H