chromeos: Update more code to get signals from powerd.

chrome/browser/chromeos/power/resume_observer.h

Index: chrome/browser/chromeos/power/resume_observer.h
diff --git a/chrome/browser/chromeos/power/resume_observer.h b/chrome/browser/chromeos/power/resume_observer.h
index 83fc153c7447e9d57e479450eae8d5ed7d734db8..7489a70ad97724a08ec86ba247b9c6ed6e3790b2 100644
--- a/chrome/browser/chromeos/power/resume_observer.h
+++ b/chrome/browser/chromeos/power/resume_observer.h
@@ -7,19 +7,25 @@
 
 #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: