chromeos: Show onscreen bubble when brightness changes.

chrome/browser/chromeos/setting_level_bubble.h

Index: chrome/browser/chromeos/setting_level_bubble.h
diff --git a/chrome/browser/chromeos/setting_level_bubble.h b/chrome/browser/chromeos/setting_level_bubble.h
index 4619127f59d13a4b1db00a9a835558ae646d6ee0..262bbdc6fd3112ded9efb0d9db17a63b220ec125 100644
--- a/chrome/browser/chromeos/setting_level_bubble.h
+++ b/chrome/browser/chromeos/setting_level_bubble.h
@@ -8,6 +8,7 @@
 
 #include "app/animation_delegate.h"
 #include "app/slide_animation.h"
+#include "base/basictypes.h"
 #include "base/timer.h"
 #include "chrome/browser/views/info_bubble.h"
 
@@ -23,6 +24,7 @@ class SettingLevelBubble : public InfoBubbleDelegate,
                            public AnimationDelegate {
  public:
   void ShowBubble(int percent);
+  void HideBubble();
 
  protected:
   explicit SettingLevelBubble(SkBitmap* increase_icon,