Disable rendering when suspending on chrome os

ash/system/chromeos/power/power_event_observer.h

 // Copyright 2013 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 ASH_SYSTEM_CHROMEOS_POWER_POWER_EVENT_OBSERVER_H_
 #define ASH_SYSTEM_CHROMEOS_POWER_POWER_EVENT_OBSERVER_H_
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/callback.h"
@@ skipping 22 matching lines @@
   void ScreenIsUnlocked() override;
 
   // Is the screen currently locked?
   bool screen_locked_;
 
   // If set, called when the lock screen has been shown to confirm that the
   // system is ready to be suspended.
   base::Closure screen_lock_callback_;
 
  private:
+  // Tells the compositor for each of the displays to resume sending rendering
+  // requests to the GPU.
+  void ResumeRenderingRequests();
+
+  // Tells the compositor for each of the displays to finish all pending
+  // rendering requests and block any new ones.
+  void StopRenderingRequests();

[Daniel Erat, 2015/02/11 14:11:42]

nit: switch the order of these two methods to mirror the calling pattern

+
   DISALLOW_COPY_AND_ASSIGN(PowerEventObserver);
 };
 
 }  // namespace chromeos
 
 #endif  // ASH_SYSTEM_CHROMEOS_POWER_POWER_EVENT_OBSERVER_H_