[Notifications] Fix swipe to close for ARC notifications.

ui/message_center/views/custom_notification_view.cc

 // Copyright 2016 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.
 
 #include "ui/message_center/views/custom_notification_view.h"
 
 #include <algorithm>
 
 #include "ui/base/ime/input_method.h"
 #include "ui/base/ime/text_input_client.h"
@@ skipping 72 matching lines @@
 
 const char* CustomNotificationView::GetClassName() const {
   return kViewClassName;
 }
 
 void CustomNotificationView::UpdateControlButtonsVisibility() {
   if (contents_view_delegate_)
     contents_view_delegate_->UpdateControlButtonsVisibility();
 }
 
+void CustomNotificationView::OnSlideChanged() {
+  if (contents_view_delegate_)
+    contents_view_delegate_->OnSlideChanged();
+}
+
 gfx::Size CustomNotificationView::GetPreferredSize() const {
   const gfx::Insets insets = GetInsets();
   const int contents_width = kNotificationWidth - insets.width();
   const int contents_height = contents_view_->GetHeightForWidth(contents_width);
   return gfx::Size(kNotificationWidth, contents_height + insets.height());
 }
 
 void CustomNotificationView::Layout() {
   MessageView::Layout();
 
@@ skipping 55 matching lines @@
 
 bool CustomNotificationView::OnMousePressed(const ui::MouseEvent& event) {
   // TODO(yhanada): This hack will be removed when HandleAccessibleAction will
   // be used for handling click events.
   if (contents_view_ && contents_view_->OnMousePressed(event))
     return true;
   return MessageView::OnMousePressed(event);
 }
 
 }  // namespace message_center