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

base/time/time.h

Index: base/time/time.h
diff --git a/base/time/time.h b/base/time/time.h
index af95700ac1eba3727db023c5ef6f8f000eea3add..c3eba0aeefa191887a418c34e9beac1bdad6d000 100644
--- a/base/time/time.h
+++ b/base/time/time.h
@@ -572,6 +572,17 @@ class BASE_EXPORT TimeTicks {
   // 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 TimeTicksNow() will have the higher resolution provided by QPC.

[darin (slow to review), 2013/08/12 18:57:36]

nit: TimeTicksNow() -> TimeTicks::Now() ?

[James Simonsen, 2013/08/12 22:57:06]

Done.

+  // Returns true if high resolution time was successfully enabled.
+  static bool MaybeEnableHighResNowEverywhere();

[darin (slow to review), 2013/08/12 18:57:36]

nit: The "Everywhere" suffix could maybe be more precise, or maybe this method
name could just be something like SetNowIsHighResNowIfSupported or
MaybeSetNowIsHighResNow?

[James Simonsen, 2013/08/12 22:57:06]

Done.

+
+  // Returns a time value that is NOT rollover protected.
+  static TimeTicks UnprotectedNow();
 #endif
 
   // Returns true if this object has not been initialized.