Allow closing root window, or pressing the power button to shutdown ash_shell, and chrome /w chrome…

ash/wm/power_button_controller.cc

 // Copyright (c) 2012 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/wm/power_button_controller.h"
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
+#include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/cursor_manager.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/time.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/shared/compound_event_filter.h"
 #include "ui/aura/window.h"
@@ skipping 446 matching lines @@
   if (!shutting_down_)
     StartShutdownAnimationAndRequestShutdown();
 }
 
 void PowerButtonController::OnRootWindowResized(const aura::RootWindow* root,
                                                 const gfx::Size& new_size) {
   if (background_layer_.get())
     background_layer_->SetBounds(gfx::Rect(root->bounds().size()));
 }
 
+void PowerButtonController::OnRootWindowHostCloseRequested(
+                                                const aura::RootWindow*) {
+  if(Shell::GetInstance() && Shell::GetInstance()->delegate())
+    Shell::GetInstance()->delegate()->Exit();
+}
+
 bool PowerButtonController::LoggedInAsNonGuest() const {
   if (login_status_ == user::LOGGED_IN_NONE)
     return false;
   if (login_status_ == user::LOGGED_IN_GUEST)
     return false;
   // TODO(mukai): think about kiosk mode.
   return true;
 }
 
 void PowerButtonController::OnLockTimeout() {
@@ skipping 88 matching lines @@
     root_layer->StackAtBottom(background_layer_.get());
   }
   background_layer_->SetVisible(true);
 }
 
 void PowerButtonController::HideBackgroundLayer() {
   background_layer_.reset();
 }
 
 }  // namespace ash