GTTF: Increase the limit for QPC drift....

base/time_win.cc

 // Copyright (c) 2009 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.
 
 
 // Windows Timer Primer
 //
 // A good article:  http://www.ddj.com/windows/184416651
 // A good mozilla bug:  http://bugzilla.mozilla.org/show_bug.cgi?id=363258
 //
@@ skipping 314 matching lines @@
   bool IsUsingHighResClock() {
     return ticks_per_microsecond_ != 0.0;
   }
 
   void DisableHighResClock() {
     ticks_per_microsecond_ = 0.0;
   }
 
   TimeDelta Now() {
     // Our maximum tolerance for QPC drifting.
-    const int kMaxTimeDrift = 50 * Time::kMicrosecondsPerMillisecond;
+    const int kMaxTimeDriftMicroseconds = 60150;
 
     if (IsUsingHighResClock()) {
       int64 now = UnreliableNow();
 
       // Verify that QPC does not seem to drift.
-      DCHECK_LT(now - ReliableNow() - skew_, kMaxTimeDrift);
+      DCHECK_LT(abs((now - ReliableNow()) - skew_), kMaxTimeDriftMicroseconds);
 
       return TimeDelta::FromMicroseconds(now);
     }
 
     // Just fallback to the slower clock.
     return RolloverProtectedNow();
   }
 
  private:
   // Synchronize the QPC clock with GetSystemTimeAsFileTime.
@@ skipping 39 matching lines @@
 
 // static
 TimeTicks TimeTicks::Now() {
   return TimeTicks() + RolloverProtectedNow();
 }
 
 // static
 TimeTicks TimeTicks::HighResNow() {
   return TimeTicks() + Singleton<HighResNowSingleton>::get()->Now();
 }