Add ripple effect to action buttons in 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 35fdbbab839a45b4392dc4993021203c031e75a8..897ca450609024947d2867fb73882d39487ba17e 100644
--- a/ui/message_center/views/notification_view_md.h
+++ b/ui/message_center/views/notification_view_md.h
@@ -16,7 +16,6 @@
 
 namespace views {
 class Label;
-class LabelButton;
 class ProgressBar;
 }
 
@@ -29,6 +28,7 @@ class ProportionalImageView;
 namespace {
 class CompactTitleMessageView;
 class ItemView;
+class NotificationButtonMD;
 }
 
 // View that displays all current types of notification (web, basic, image, and
@@ -104,7 +104,7 @@ class MESSAGE_CENTER_EXPORT NotificationViewMD
   ProportionalImageView* icon_view_ = nullptr;
   views::View* image_container_ = nullptr;
   ProportionalImageView* image_view_ = nullptr;
-  std::vector<views::LabelButton*> action_buttons_;
+  std::vector<NotificationButtonMD*> action_buttons_;

[fukino, 2017/06/29 04:11:03]

We can still keep the type as views::LabelButton* in this header.

[tetsui, 2017/06/29 04:23:11]

Done.

   std::vector<ItemView*> item_views_;
   views::ProgressBar* progress_bar_view_ = nullptr;
   CompactTitleMessageView* compact_title_message_view_ = nullptr;