Add UMA for High Resolution Timer Usage

base/timer/hi_res_timer_manager.h

 // Copyright (c) 2011 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_TIMER_HI_RES_TIMER_MANAGER_H_
 #define BASE_TIMER_HI_RES_TIMER_MANAGER_H_
 
 #include "base/base_export.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "base/power_monitor/power_observer.h"
+#include "base/timer/timer.h"
+#include "build/build_config.h"
 
 namespace base {
 
 // Ensures that the Windows high resolution timer is only used
 // when not running on battery power.
 class BASE_EXPORT HighResolutionTimerManager : public base::PowerObserver {
  public:
   HighResolutionTimerManager();
   ~HighResolutionTimerManager() override;
 
-  // base::PowerObserver method.
+  // base::PowerObserver methods.
   void OnPowerStateChange(bool on_battery_power) override;
+  void OnSuspend() override;
+  void OnResume() override;
 
   // 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_available_;
 
+#if defined(OS_WIN)
+  // Timer for polling the high resolution timer usage.
+  base::RepeatingTimer timer_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(HighResolutionTimerManager);
 };
 
 }  // namespace base
 
 #endif  // BASE_TIMER_HI_RES_TIMER_MANAGER_H_