chromeos: Add power supply info reading capability

chrome/browser/automation/testing_automation_provider.h

Index: chrome/browser/automation/testing_automation_provider.h
diff --git a/chrome/browser/automation/testing_automation_provider.h b/chrome/browser/automation/testing_automation_provider.h
index c0e5d7bd653e5d1b9f76dbf75c23b484ca7f72d9..0594edea2f0b9758fc52f0fb67f62e9c012bcc14 100644
--- a/chrome/browser/automation/testing_automation_provider.h
+++ b/chrome/browser/automation/testing_automation_provider.h
@@ -43,7 +43,7 @@ class TestingAutomationProvider : public AutomationProvider,
                                   public BrowserList::Observer,
                                   public importer::ImporterListObserver,
 #if defined(OS_CHROMEOS)
-                                  public chromeos::PowerLibrary::Observer,
+                                  public chromeos::PowerManagerClient::Observer,
 #endif // defined(OS_CHROMEOS)
                                   public content::NotificationObserver {
 
@@ -1329,9 +1329,8 @@ class TestingAutomationProvider : public AutomationProvider,
                            DictionaryValue* args,
                            IPC::Message* reply_message);
 
-  // chromeos::PowerLibrary::Observer overrides.
+  // chromeos::PowerManagerClient::Observer overrides.
   virtual void PowerChanged(const chromeos::PowerSupplyStatus& status) OVERRIDE;
-  virtual void SystemResumed() OVERRIDE {}
 #endif  // defined(OS_CHROMEOS)
 
   void WaitForTabCountToBecome(int browser_handle,