Add device policy to disallow shutdown - WebUI modifications

ash/system/date/date_default_view.cc

 // Copyright 2014 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 "ash/system/date/date_default_view.h"
 
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/system/date/date_view.h"
@@ skipping 84 matching lines @@
   SystemTrayDelegate* system_tray_delegate =
       Shell::GetInstance()->system_tray_delegate();
   if (system_tray_delegate)
     system_tray_delegate->RemoveShutdownPolicyObserver(this);
 }
 
 views::View* DateDefaultView::GetHelpButtonView() {
   return help_button_;
 }
 
+const views::View* DateDefaultView::GetShutdownButtonViewForTest() const {
+  return shutdown_button_;
+}
+
 tray::DateView* DateDefaultView::GetDateView() {
   return date_view_;
 }
 
 const tray::DateView* DateDefaultView::GetDateView() const {
   return date_view_;
 }
 
 void DateDefaultView::ButtonPressed(views::Button* sender,
                                     const ui::Event& event) {
@@ skipping 16 matching lines @@
 void DateDefaultView::OnShutdownPolicyChanged(bool reboot_on_shutdown) {
   if (!shutdown_button_)
     return;
 
   shutdown_button_->SetTooltipText(l10n_util::GetStringUTF16(
       reboot_on_shutdown ? IDS_ASH_STATUS_TRAY_REBOOT
                          : IDS_ASH_STATUS_TRAY_SHUTDOWN));
 }
 
 }  // namespace ash