chromeos: Update more code to get signals from powerd.

chrome/browser/chromeos/power/resume_observer.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 CHROME_BROWSER_CHROMEOS_POWER_RESUME_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_POWER_RESUME_OBSERVER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "chromeos/dbus/power_manager_client.h"
 #include "chromeos/dbus/root_power_manager_observer.h"
 
 namespace chromeos {
 
 // A class to observe system resume events and dispatch onWokeUp extension API
 // events.
-class ResumeObserver : public RootPowerManagerObserver {
+class ResumeObserver : public PowerManagerClient::Observer,
+                       public RootPowerManagerObserver {
  public:
   // This class registers/unregisters itself as an observer in ctor/dtor.
   ResumeObserver();
   virtual ~ResumeObserver();
 
+  // PowerManagerClient::Observer overrides:
+  virtual void SystemResumed(const base::TimeDelta& sleep_duration) OVERRIDE;
+
   // RootPowerManagerObserver overrides:
+  // TODO(derat): Remove this once notifications are sent by powerd.
   virtual void OnResume(const base::TimeDelta& sleep_duration) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ResumeObserver);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_POWER_RESUME_OBSERVER_H_