Reland old fix that was reverted without my knowledge.

content/common/hi_res_timer_manager.h

Index: content/common/hi_res_timer_manager.h
===================================================================
--- content/common/hi_res_timer_manager.h	(revision 82646)
+++ content/common/hi_res_timer_manager.h	(working copy)
@@ -18,11 +18,14 @@
   // ui::SystemMonitor::PowerObserver:
   virtual void OnPowerStateChange(bool on_battery_power);
 
+  // Returns true if the hi resolution clock could be used right now.
+  bool hi_res_clock_available() const { return hi_res_clock_available_; }
+
  private:
   // Enable or disable the faster multimedia timer.
   void UseHiResClock(bool use);
 
-  bool hi_res_clock_used_;
+  bool hi_res_clock_available_;
 
   DISALLOW_COPY_AND_ASSIGN(HighResolutionTimerManager);
 };