ash: Move AppList support to ShelfWidget, expose ShelfWidget in WmShelf

ash/common/shelf/shelf_widget.cc

 // Copyright 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/common/shelf/shelf_widget.h"
 
 #include "ash/common/focus_cycler.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shelf/shelf_background_animator_observer.h"
@@ skipping 503 matching lines @@
 gfx::Rect ShelfWidget::GetScreenBoundsOfItemIconForWindow(WmWindow* window) {
   ShelfID id = window->GetIntProperty(WmWindowProperty::SHELF_ID);
   gfx::Rect bounds(shelf_view_->GetIdealBoundsOfItemIcon(id));
   gfx::Point screen_origin;
   views::View::ConvertPointToScreen(shelf_view_, &screen_origin);
   return gfx::Rect(screen_origin.x() + bounds.x(),
                    screen_origin.y() + bounds.y(), bounds.width(),
                    bounds.height());
 }
 
+AppListButton* ShelfWidget::GetAppListButton() const {
+  return shelf_view_->GetAppListButton();
+}
+
+app_list::ApplicationDragAndDropHost*
+ShelfWidget::GetDragAndDropHostForAppList() {
+  return shelf_view_;
+}
+
 void ShelfWidget::OnWidgetActivationChanged(views::Widget* widget,
                                             bool active) {
   activating_as_fallback_ = false;
   if (active)
     delegate_view_->SetPaneFocusAndFocusDefault();
   else
     delegate_view_->GetFocusManager()->ClearFocus();
 }
 
 int ShelfWidget::GetDimmingAlphaForTest() {
@@ skipping 17 matching lines @@
   if (shelf_view_)
     shelf_view_->UpdateShelfItemBackground(alpha);
 }
 
 void ShelfWidget::WillDeleteShelfLayoutManager() {
   shelf_layout_manager_->RemoveObserver(this);
   shelf_layout_manager_ = nullptr;
 }
 
 }  // namespace ash