Intorduce PowerButtonObserver API

athena/system/power_button_controller.h

Index: athena/system/power_button_controller.h
diff --git a/athena/system/power_button_controller.h b/athena/system/power_button_controller.h
index b1540b9e38170bc5f3c1a750e00984e567f6413f..3077af08680e8e3d4bb4176cc11a31d80524462c 100644
--- a/athena/system/power_button_controller.h
+++ b/athena/system/power_button_controller.h
@@ -5,10 +5,10 @@
 #ifndef ATHENA_SYSTEM_POWER_BUTTON_CONTROLLER_H_
 #define ATHENA_SYSTEM_POWER_BUTTON_CONTROLLER_H_
 
+#include "athena/input/public/input_manager.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
-#include "chromeos/dbus/power_manager_client.h"
 
 namespace aura {
 class Window;
@@ -21,7 +21,7 @@ class Widget;
 namespace athena {
 
 // Shuts down in response to the power button being pressed.
-class PowerButtonController : public chromeos::PowerManagerClient::Observer {
+class PowerButtonController : public PowerButtonObserver {

[oshima, 2014/10/15 22:28:53]

This class should probably be renamed to something like ShutdownDialog. I'll
create a separate CL for it.

  public:
   explicit PowerButtonController(aura::Window* dialog_container);
   virtual ~PowerButtonController();
@@ -47,11 +47,9 @@ class PowerButtonController : public chromeos::PowerManagerClient::Observer {
   // Requests shutdown.
   void Shutdown();
 
-  // chromeos::PowerManagerClient::Observer:
-  virtual void BrightnessChanged(int level, bool user_initiated) override;
-  virtual void PowerButtonEventReceived(
-      bool down,
-      const base::TimeTicks& timestamp) override;
+  // PowerButtonObserver:
+  virtual void OnPowerButtonStateChanged(
+      PowerButtonObserver::State state) override;
 
   // |shutdown_warning_message_|'s parent container.
   aura::Window* warning_message_container_;
@@ -59,12 +57,6 @@ class PowerButtonController : public chromeos::PowerManagerClient::Observer {
   // Shows a warning that the device is about to be shutdown.
   scoped_ptr<views::Widget> shutdown_warning_message_;
 
-  // Whether the screen brightness was reduced to 0%.
-  bool brightness_is_zero_;
-
-  // The last time at which the screen brightness was 0%.
-  base::TimeTicks zero_brightness_end_time_;
-
   State state_;
 
   base::OneShotTimer<PowerButtonController> timer_;