Adjust behavior of control buttons of 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 60 matching lines @@
   if (contents_view_delegate_)
     contents_view_delegate_->RequestFocusOnCloseButton();
 }
 
 bool CustomNotificationView::IsPinned() const {
   if (!contents_view_delegate_)
     return false;
   return contents_view_delegate_->IsPinned();
 }
 
+void CustomNotificationView::UpdateControlButtonsVisibility() {
+  if (contents_view_delegate_)
+    contents_view_delegate_->UpdateControlButtonsVisibility();
+}
+
 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);
 
   // This is union of max/min height for M (256-64) and N (284-92).
   constexpr int kMaxContentHeight = 284;
   constexpr int kMinContentHeight = 64;
   return gfx::Size(kNotificationWidth,
                    std::max(kMinContentHeight + insets.height(),
@@ skipping 54 matching lines @@
 }
 
 void CustomNotificationView::ChildPreferredSizeChanged(View* child) {
   // Notify MessageCenterController when the custom content changes size,
   // as it may need to relayout.
   if (controller())
     controller()->UpdateNotificationSize(notification_id());
 }
 
 }  // namespace message_center