chromeos: Show onscreen bubble when brightness changes.

chrome/browser/chromeos/brightness_observer.cc

Index: chrome/browser/chromeos/brightness_observer.cc
diff --git a/chrome/browser/chromeos/brightness_observer.cc b/chrome/browser/chromeos/brightness_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f501b2a4bd59efbb796dd7f16dc01f4d15e263a5
--- /dev/null
+++ b/chrome/browser/chromeos/brightness_observer.cc
@@ -0,0 +1,17 @@
+// Copyright (c) 2010 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.
+
+#include "chrome/browser/chromeos/brightness_observer.h"
+
+#include "chrome/browser/chromeos/brightness_bubble.h"
+#include "chrome/browser/chromeos/volume_bubble.h"
+
+namespace chromeos {
+
+void BrightnessObserver::BrightnessChanged(int level) {
+  BrightnessBubble::instance()->ShowBubble(level);
+  VolumeBubble::instance()->HideBubble();
+}
+
+}  // namespace chromeos