Add notification settings button to ARC notifications.

ui/message_center/message_center_style.cc

 // 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.
 
 #include "ui/message_center/message_center_style.h"
 
 #include <algorithm>
 
 #include "ui/gfx/color_palette.h"
 #include "ui/gfx/image/image_skia.h"
@@ skipping 27 matching lines @@
   return scaled_size;
 }
 
 // Icons.
 
 gfx::ImageSkia GetCloseIcon() {
   return gfx::CreateVectorIcon(kNotificationCloseButtonIcon,
                                gfx::kChromeIconGrey);
 }
 
+gfx::ImageSkia GetSettingsIcon() {
+  return gfx::CreateVectorIcon(kNotificationSettingsButtonIcon,
+                               gfx::kChromeIconGrey);
+}
+
 }  // namespace message_center