Adds a small icon to notifications, and connects it to synced notifications.

ui/message_center/message_center_impl.h

 // Copyright (c) 2013 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.
 
 #ifndef UI_MESSAGE_CENTER_MESSAGE_CENTER_IMPL_H_
 #define UI_MESSAGE_CENTER_MESSAGE_CENTER_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 152 matching lines @@
   virtual void RemoveNotification(const std::string& id, bool by_user) OVERRIDE;
   virtual void RemoveAllNotifications(bool by_user) OVERRIDE;
   virtual void RemoveAllVisibleNotifications(bool by_user) OVERRIDE;
   virtual void SetNotificationIcon(const std::string& notification_id,
                                    const gfx::Image& image) OVERRIDE;
   virtual void SetNotificationImage(const std::string& notification_id,
                                     const gfx::Image& image) OVERRIDE;
   virtual void SetNotificationButtonIcon(const std::string& notification_id,
                                          int button_index,
                                          const gfx::Image& image) OVERRIDE;
+  virtual void SetNotificationSmallImage(const std::string& notification_id,
+                                         const gfx::Image& image) OVERRIDE;
   virtual void DisableNotificationsByNotifier(
       const NotifierId& notifier_id) OVERRIDE;
   virtual void ExpandNotification(const std::string& id) OVERRIDE;
   virtual void ClickOnNotification(const std::string& id) OVERRIDE;
   virtual void ClickOnNotificationButton(const std::string& id,
                                          int button_index) OVERRIDE;
   virtual void MarkSinglePopupAsShown(const std::string& id,
                                       bool mark_notification_as_read) OVERRIDE;
   virtual void DisplayedNotification(const std::string& id) OVERRIDE;
   virtual void SetNotifierSettingsProvider(
@@ skipping 35 matching lines @@
   // Queue for the notifications to delay the addition/updates when the message
   // center is visible.
   scoped_ptr<internal::ChangeQueue> notification_queue_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageCenterImpl);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_H_