chromeos: Implement power button animations for Aura.

chrome/browser/chromeos/login/screen_locker.h

Index: chrome/browser/chromeos/login/screen_locker.h
diff --git a/chrome/browser/chromeos/login/screen_locker.h b/chrome/browser/chromeos/login/screen_locker.h
index 730c95cc88f902b22a4215dc38d84181f47bb494..07509e9122d96330e4aa77d093292b8a3218d41d 100644
--- a/chrome/browser/chromeos/login/screen_locker.h
+++ b/chrome/browser/chromeos/login/screen_locker.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -40,6 +40,8 @@ class ScreenLocker : public LoginStatusConsumer {
     return screen_locker_;
   }
 
+  bool locked() const { return locked_; }
+
   // Initialize and show the screen locker.
   void Init();