Add ripple effect to action in expand button.

ui/message_center/views/notification_header_view.h

 // Copyright 2017 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_VIEWS_NOTIFICATION_HEADER_VIEW_H_
 #define UI_MESSAGE_CENTER_VIEWS_NOTIFICATION_HEADER_VIEW_H_
 
 #include "base/macros.h"
 #include "ui/message_center/views/padded_button.h"
 #include "ui/views/controls/button/custom_button.h"
 
 namespace views {
 class ImageButton;
 class ImageView;
 class Label;
 }
 
 namespace message_center {
 
+namespace {
+class ExpandButton;

[yoshiki, 2017/07/03 06:15:47]

We should avoid forward declaring a methods in  anonymous namespace. Could you
make it a child-class of NotificationHeaderView, or make it non-friend?

[tetsui, 2017/07/03 07:10:54]

Done.

+}
+
 class NotificationHeaderView : public views::CustomButton {
  public:
+  friend class ExpandButton;
+
   NotificationHeaderView(views::ButtonListener* listener);
   void SetAppIcon(const gfx::ImageSkia& img);
   void SetAppName(const base::string16& name);
   void SetProgress(int progress);
   void SetExpandButtonEnabled(bool enabled);
   void SetExpanded(bool expanded);
   void SetSettingsButtonEnabled(bool enabled);
   void SetCloseButtonEnabled(bool enabled);
   void SetControlButtonsVisible(bool visible);
   void ClearProgress();
@@ skipping 28 matching lines @@
   bool close_button_enabled_ = false;
   bool is_control_buttons_visible_ = false;
   bool has_summary_text_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationHeaderView);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_VIEWS_NOTIFICATION_HEADER_VIEW_H_