chromeos: Move device shutdown handling out of chrome into ash

ash/common/system/tiles/tiles_default_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 "ash/common/system/tiles/tiles_default_view.h"
 
 #include "ash/common/metrics/user_metrics_action.h"
 #include "ash/common/session/session_state_delegate.h"
+#include "ash/common/shutdown_controller.h"
 #include "ash/common/system/tray/system_menu_button.h"
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/system_tray_controller.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/system_tray_item.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_popup_utils.h"
 #include "ash/common/wm_shell.h"
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "grit/ash_strings.h"
@@ skipping 18 matching lines @@
 }  // namespace
 
 namespace ash {
 
 TilesDefaultView::TilesDefaultView(SystemTrayItem* owner, LoginStatus login)
     : owner_(owner),
       login_(login),
       settings_button_(nullptr),
       help_button_(nullptr),
       lock_button_(nullptr),
-      power_button_(nullptr),
-      weak_factory_(this) {}
+      power_button_(nullptr) {}
 
-TilesDefaultView::~TilesDefaultView() {
-  SystemTrayDelegate* system_tray_delegate =
-      WmShell::Get()->system_tray_delegate();
-
-  // Perform this check since the delegate is destroyed first upon shell
-  // destruction.
-  if (system_tray_delegate)
-    system_tray_delegate->RemoveShutdownPolicyObserver(this);
-}
+TilesDefaultView::~TilesDefaultView() {}
 
 void TilesDefaultView::Init() {
   WmShell* shell = WmShell::Get();
   views::BoxLayout* box_layout =
       new views::BoxLayout(views::BoxLayout::kHorizontal, 4, 0, 0);
   box_layout->set_main_axis_alignment(
       views::BoxLayout::MAIN_AXIS_ALIGNMENT_START);
   box_layout->set_cross_axis_alignment(
       views::BoxLayout::CROSS_AXIS_ALIGNMENT_CENTER);
   SetLayoutManager(box_layout);
@@ skipping 33 matching lines @@
   if (disable_buttons || !shell->GetSessionStateDelegate()->CanLockScreen())
     lock_button_->SetState(views::Button::STATE_DISABLED);
 
   AddChildView(lock_button_);
   AddChildView(TrayPopupUtils::CreateVerticalSeparator());
 
   power_button_ =
       new SystemMenuButton(this, SystemMenuButton::InkDropStyle::FLOOD_FILL,
                            kSystemMenuPowerIcon, IDS_ASH_STATUS_TRAY_SHUTDOWN);
   AddChildView(power_button_);
-  SystemTrayDelegate* system_tray_delegate = shell->system_tray_delegate();
-  system_tray_delegate->AddShutdownPolicyObserver(this);
-  system_tray_delegate->ShouldRebootOnShutdown(base::Bind(
-      &TilesDefaultView::OnShutdownPolicyChanged, weak_factory_.GetWeakPtr()));
+  // This object is recreated every time the menu opens. Don't bother updating
+  // the tooltip if the shutdown policy changes while the menu is open.
+  bool reboot = WmShell::Get()->shutdown_controller()->reboot_on_shutdown();
+  power_button_->SetTooltipText(l10n_util::GetStringUTF16(
+      reboot ? IDS_ASH_STATUS_TRAY_REBOOT : IDS_ASH_STATUS_TRAY_SHUTDOWN));
 #endif  // !defined(OS_WIN)
 }
 
 void TilesDefaultView::ButtonPressed(views::Button* sender,
                                      const ui::Event& event) {
   DCHECK(sender);
   WmShell* shell = WmShell::Get();
   if (sender == settings_button_) {
     shell->RecordUserMetricsAction(UMA_TRAY_SETTINGS);
     shell->system_tray_controller()->ShowSettings();
   } else if (sender == help_button_) {
     shell->RecordUserMetricsAction(UMA_TRAY_HELP);
     shell->system_tray_controller()->ShowHelp();
   } else if (sender == lock_button_) {
     shell->RecordUserMetricsAction(UMA_TRAY_LOCK_SCREEN);
 #if defined(OS_CHROMEOS)
     chromeos::DBusThreadManager::Get()
         ->GetSessionManagerClient()
         ->RequestLockScreen();
 #endif
   } else if (sender == power_button_) {
     shell->RecordUserMetricsAction(UMA_TRAY_SHUT_DOWN);
     shell->RequestShutdown();
   }
 
   owner_->system_tray()->CloseSystemBubble();
 }
 
-void TilesDefaultView::OnShutdownPolicyChanged(bool reboot_on_shutdown) {
-  if (!power_button_)
-    return;
-
-  power_button_->SetTooltipText(l10n_util::GetStringUTF16(
-      reboot_on_shutdown ? IDS_ASH_STATUS_TRAY_REBOOT
-                         : IDS_ASH_STATUS_TRAY_SHUTDOWN));
-}
-
 views::View* TilesDefaultView::GetHelpButtonView() const {
   return help_button_;
 }
 
 const views::CustomButton* TilesDefaultView::GetShutdownButtonViewForTest()
     const {
   return power_button_;
 }
 
 }  // namespace ash