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

ui/message_center/views/notification_view.cc

Index: ui/message_center/views/notification_view.cc
diff --git a/ui/message_center/views/notification_view.cc b/ui/message_center/views/notification_view.cc
index 7b258ab8184a9bb764906387b610b42a2b537cc5..028d9d34512062477353a33378e6a3f5b7a2a8d1 100644
--- a/ui/message_center/views/notification_view.cc
+++ b/ui/message_center/views/notification_view.cc
@@ -305,6 +305,7 @@ NotificationView::NotificationView(MessageCenterController* controller,
     : MessageView(this,
                   notification.id(),
                   notification.notifier_id(),
+                  notification.small_image().AsImageSkia(),
                   notification.display_source()),
       controller_(controller),
       clickable_(notification.clickable()),
@@ -465,6 +466,7 @@ NotificationView::NotificationView(MessageCenterController* controller,
   AddChildView(top_view_);
   AddChildView(icon_view_);
   AddChildView(bottom_view_);
+  AddChildView(small_image());
   AddChildView(close_button());
   AddChildView(expand_button_);
   set_accessible_name(JoinString(accessible_lines, '\n'));