Add List notification support to new-style notification.

ui/message_center/views/notification_view_md.h

Index: ui/message_center/views/notification_view_md.h
diff --git a/ui/message_center/views/notification_view_md.h b/ui/message_center/views/notification_view_md.h
index 4d8054e2a1f912f2b08d556e25eea76eeca342f4..1dab4b2d5187e742a43f68d370eb3533f2abcebb 100644
--- a/ui/message_center/views/notification_view_md.h
+++ b/ui/message_center/views/notification_view_md.h
@@ -99,6 +99,8 @@ class MESSAGE_CENTER_EXPORT NotificationViewMD
   ProportionalImageView* image_view_ = nullptr;
   std::vector<views::LabelButton*> action_buttons_;
 
+  std::vector<views::View*> item_views_;

[fukino, 2017/06/13 04:27:09]

nit: Remove the blank line above, since item_views_ is a part of "Views which
are dinamically ...(snip"

[tetsui, 2017/06/13 04:55:03]

Done.

+
   DISALLOW_COPY_AND_ASSIGN(NotificationViewMD);
 };