Add ripple effect to new-style notification header.

ui/message_center/views/notification_header_view.h

Index: ui/message_center/views/notification_header_view.h
diff --git a/ui/message_center/views/notification_header_view.h b/ui/message_center/views/notification_header_view.h
index b5fbbc0aa3f3f142394766ade6e3d18d8236918c..3c85b05901fe1f73b9c315f4933f2363e9f5e98a 100644
--- a/ui/message_center/views/notification_header_view.h
+++ b/ui/message_center/views/notification_header_view.h
@@ -32,6 +32,11 @@ class NotificationHeaderView : public views::CustomButton {
   bool IsCloseButtonEnabled();
   bool IsCloseButtonFocused();
 
+  std::unique_ptr<views::InkDrop> CreateInkDrop() override;

[yoshiki, 2017/06/29 08:09:06]

nit: This class is mix of inherited and original methods. So please mention that
these methods are overridden from a parent class.

See the example of other classes.
https://cs.chromium.org/search/?q=override:+file:.h$+package:%5Echromium$&typ...

[tetsui, 2017/06/29 11:35:52]

Done.

+  std::unique_ptr<views::InkDropRipple> CreateInkDropRipple() const override;
+  std::unique_ptr<views::InkDropHighlight> CreateInkDropHighlight()
+      const override;
+
   views::ImageButton* expand_button() { return expand_button_; }
   views::ImageButton* settings_button() { return settings_button_; }
   views::ImageButton* close_button() { return close_button_; }