views: Extract Widget observer into its own header file.

ash/wm/app_list_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/app_list_controller.h"
 
 #include "ash/launcher/launcher.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/shelf_layout_manager.h"
 #include "ui/app_list/app_list_view.h"
 #include "ui/app_list/icon_cache.h"
 #include "ui/app_list/pagination_model.h"
 #include "ui/aura/event.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/transform_util.h"
+#include "ui/views/widget/widget.h"
 
 namespace ash {
 namespace internal {
 
 namespace {
 
 // Duration for show/hide animation in milliseconds.
 const int kAnimationDurationMs = 200;
 
 // Offset in pixels to animation away/towards the launcher.
@@ skipping 247 matching lines @@
 // AppListController, ui::ImplicitAnimationObserver implementation:
 
 void AppListController::OnImplicitAnimationsCompleted() {
   if (is_visible_ )
     view_->GetWidget()->Activate();
   else
     view_->GetWidget()->Close();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-// AppListController, views::Widget::Observer implementation:
+// AppListController, views::WidgetObserver implementation:
 
 void AppListController::OnWidgetClosing(views::Widget* widget) {
   DCHECK(view_->GetWidget() == widget);
   if (is_visible_)
     SetVisible(false);
   ResetView();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // AppListController, ShellObserver implementation:
 void AppListController::OnShelfAlignmentChanged() {
   if (view_)
     view_->SetBubbleArrowLocation(GetBubbleArrowLocation());
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // AppListController, LauncherIconObserver implementation:
 
 void AppListController::OnLauncherIconPositionsChanged() {
   UpdateBounds();
 }
 
 }  // namespace internal
 }  // namespace ash