chromeos: Notify observers after display power changes.

chromeos/display/output_configurator.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 CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_
 #define CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 329 matching lines @@
   }
 
   // Configure outputs with |kConfigureDelayMs| delay,
   // so that time-consuming ConfigureOutputs() won't be called multiple times.
   void ScheduleConfigureOutputs();
 
  private:
   // Configure outputs.
   void ConfigureOutputs();
 
-  // Fires OnDisplayModeChanged() event to the observers.
-  void NotifyOnDisplayChanged();
+  // Notifies observers about an attempted state change. Indicates success if
+  // |attempted_state| matches |output_state_| and indicates failure otherwise.
+  void NotifyObservers(OutputState attempted_state);
 
   // Switches to the state specified in |output_state| and |power_state|.
   // If the hardware mirroring failed and |mirroring_controller_| is set,
   // it switches to |STATE_DUAL_EXTENDED| and calls |SetSoftwareMirroring()|
   // to enable software based mirroring.
   // On success, updates |output_state_|, |power_state_|, and |cached_outputs_|
   // and returns true.
   bool EnterStateOrFallBackToSoftwareMirroring(
       OutputState output_state,
       DisplayPowerState power_state,
@@ skipping 62 matching lines @@
   scoped_ptr<base::OneShotTimer<OutputConfigurator> > configure_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(OutputConfigurator);
 };
 
 typedef std::vector<OutputConfigurator::OutputSnapshot> OutputSnapshotList;
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_