Hide icons in message center on lock screen

ui/message_center/views/message_center_button_bar.cc

 // Copyright 2013 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/message_center_button_bar.h"
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "ui/base/models/simple_menu_model.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 224 matching lines @@
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   // The close-bubble button.
   column->AddColumn(views::GridLayout::LEADING,
                     views::GridLayout::LEADING,
                     0.0f,
                     views::GridLayout::USE_PREF,
                     0,
                     0);
 #endif
 
-  layout->StartRow(0, 0);
+  layout->StartRowWithHeight(0, 0, kButtonSize);
   if (title_arrow_->visible())
     layout->AddView(title_arrow_);
   layout->AddView(notification_label_);
   layout->AddView(button_container_);
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   layout->AddView(close_bubble_button_);
 #endif
 }
 
 MessageCenterButtonBar::~MessageCenterButtonBar() {}
@@ skipping 17 matching lines @@
   if (title_arrow_)
     title_arrow_->SetVisible(visible);
   ViewVisibilityChanged();
   Layout();
 }
 
 void MessageCenterButtonBar::SetTitle(const base::string16& title) {
   notification_label_->SetText(title);
 }
 
+void MessageCenterButtonBar::SetButtonsVisible(bool visible) {
+  settings_button_->SetVisible(visible);
+  quiet_mode_button_->SetVisible(visible);
+
+  if (close_all_button_)
+    close_all_button_->SetVisible(visible);
+
+  ViewVisibilityChanged();
+  Layout();
+}
+
 void MessageCenterButtonBar::ChildVisibilityChanged(views::View* child) {
   InvalidateLayout();
 }
 
 void MessageCenterButtonBar::ButtonPressed(views::Button* sender,
                                            const ui::Event& event) {
   if (sender == close_all_button_) {
     message_center_view()->ClearAllClosableNotifications();
   } else if (sender == settings_button_ || sender == title_arrow_) {
     MessageCenterView* center_view = message_center_view();
     center_view->SetSettingsVisible(!center_view->settings_visible());
   } else if (sender == quiet_mode_button_) {
     if (message_center()->IsQuietMode())
       message_center()->SetQuietMode(false);
     else
       message_center()->EnterQuietModeWithExpire(base::TimeDelta::FromDays(1));
     quiet_mode_button_->SetToggled(message_center()->IsQuietMode());
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   } else if (sender == close_bubble_button_) {
     message_center_view()->tray()->HideMessageCenterBubble();
 #endif
   } else {
     NOTREACHED();
   }
 }
 
 }  // namespace message_center