ash: Resize PowerButtonController background layer.

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_window_ids.h"
 #include "ash/wm/root_window_event_filter.h"
@@ skipping 257 matching lines @@
     }
   }
   return true;
 }
 
 bool PowerButtonController::TestApi::BackgroundLayerIsVisible() const {
   return controller_->background_layer_.get() &&
          controller_->background_layer_->visible();
 }
 
+gfx::Rect PowerButtonController::TestApi::GetBackgroundLayerBounds() const {
+  ui::Layer* layer = controller_->background_layer_.get();
+  return layer ? layer->bounds() : gfx::Rect();
+}
+
 PowerButtonController::PowerButtonController()
     : login_status_(user::LOGGED_IN_NONE),
       unlocked_login_status_(user::LOGGED_IN_NONE),
       power_button_down_(false),
       lock_button_down_(false),
       shutting_down_(false),
       has_legacy_power_button_(
           CommandLine::ForCurrentProcess()->HasSwitch(
               switches::kAuraLegacyPowerButton)) {
+  Shell::GetInstance()->GetRootWindow()->AddRootWindowObserver(this);
 }
 
 PowerButtonController::~PowerButtonController() {
+  Shell::GetInstance()->GetRootWindow()->RemoveRootWindowObserver(this);
 }
 
 void PowerButtonController::OnLoginStateChanged(user::LoginStatus status) {
   login_status_ = status;
   unlocked_login_status_ = user::LOGGED_IN_NONE;
 }
 
 void PowerButtonController::OnAppTerminating() {
   // If we hear that Chrome is exiting but didn't request it ourselves, all we
   // can really hope for is that we'll have time to clear the screen.
@@ skipping 251 matching lines @@
     root_layer->StackAtBottom(background_layer_.get());
   }
   background_layer_->SetVisible(true);
 }
 
 void PowerButtonController::HideBackgroundLayer() {
   background_layer_.reset();
 }
 
 }  // namespace ash