Enable high resolution time for TimeTicks::Now on Windows Canary

base/time/time.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.
 
 // Time represents an absolute point in time, internally represented as
 // microseconds (s/1,000,000) since the Windows epoch (1601-01-01 00:00:00 UTC)
 // (See http://crbug.com/14734).  System-dependent clock interface routines are
 // defined in time_PLATFORM.cc.
 //
 // TimeDelta represents a duration of time, internally represented in
@@ skipping 554 matching lines @@
 
 #if defined(OS_WIN)
   // Get the absolute value of QPC time drift. For testing.
   static int64 GetQPCDriftMicroseconds();
 
   static TimeTicks FromQPCValue(LONGLONG qpc_value);
 
   // Returns true if the high resolution clock is working on this system.
   // This is only for testing.
   static bool IsHighResClockWorking();
+
+  // Enable high resolution time for TimeTicks::Now(). This function will
+  // test for the availability of a working implementation of
+  // QueryPerformanceCounter(). If one is not available, this function does
+  // nothing and the resolution of Now() remains 1ms. Otherwise, all future
+  // calls to TimeTicks::Now() will have the higher resolution provided by QPC.
+  // Returns true if high resolution time was successfully enabled.
+  static bool SetNowIsHighResNowIfSupported();
+
+  // Returns a time value that is NOT rollover protected.
+  static TimeTicks UnprotectedNow();
 #endif
 
   // Returns true if this object has not been initialized.
   bool is_null() const {
     return ticks_ == 0;
   }
 
   // Converts an integer value representing TimeTicks to a class. This is used
   // when deserializing a |TimeTicks| structure, using a value known to be
   // compatible. It is not provided as a constructor because the integer type
@@ skipping 73 matching lines @@
 #endif
 };
 
 inline TimeTicks TimeDelta::operator+(TimeTicks t) const {
   return TimeTicks(t.ticks_ + delta_);
 }
 
 }  // namespace base
 
 #endif  // BASE_TIME_TIME_H_