High resolution timer fix for Windows

base/message_loop/message_pump.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 BASE_MESSAGE_LOOP_MESSAGE_PUMP_H_
 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_H_
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 #include "base/message_loop/timer_slack.h"
@@ skipping 21 matching lines @@
     // message pump would otherwise sleep waiting for more work.  Returns true
     // to indicate that delayed work was done.  DoIdleWork will not be called
     // if DoDelayedWork returns true.  Upon return |next_delayed_work_time|
     // indicates the time when DoDelayedWork should be called again.  If
     // |next_delayed_work_time| is null (per Time::is_null), then the queue of
     // future delayed work (timer events) is currently empty, and no additional
     // calls to this function need to be scheduled.
     virtual bool DoDelayedWork(TimeTicks* next_delayed_work_time) = 0;
 
     // Called from within Run just before the message pump goes to sleep.
-    // Returns true to indicate that idle work was done.
+    // Returns true to indicate that idle work was done. Returning false means
+    // the pump will now wait.
     virtual bool DoIdleWork() = 0;
   };
 
   MessagePump();
   virtual ~MessagePump();
 
   // The Run method is called to enter the message pump's run loop.
   //
   // Within the method, the message pump is responsible for processing native
   // messages as well as for giving cycles to the delegate periodically.  The
@@ skipping 69 matching lines @@
   // used on the thread that called Run.
   virtual void ScheduleDelayedWork(const TimeTicks& delayed_work_time) = 0;
 
   // Sets the timer slack to the specified value.
   virtual void SetTimerSlack(TimerSlack timer_slack);
 };
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_H_