views: Make view::Views::GetPreferredSize() const.

ui/app_list/views/apps_container_view.cc

 // Copyright 2013 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 "ui/app_list/views/apps_container_view.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 83 matching lines @@
     return;
 
   PrepareToShowApps(folder_item);
   SetShowState(SHOW_ITEM_REPARENT, false);
 }
 
 bool AppsContainerView::IsInFolderView() const {
   return show_state_ == SHOW_ACTIVE_FOLDER;
 }
 
-gfx::Size AppsContainerView::GetPreferredSize() {
+gfx::Size AppsContainerView::GetPreferredSize() const {
   const gfx::Size grid_size = apps_grid_view_->GetPreferredSize();
   const gfx::Size folder_view_size = app_list_folder_view_->GetPreferredSize();
 
   int width = std::max(grid_size.width(), folder_view_size.width());
   int height = std::max(grid_size.height(), folder_view_size.height());
   return gfx::Size(width, height);
 }
 
 void AppsContainerView::Layout() {
   gfx::Rect rect(GetContentsBounds());
@@ skipping 112 matching lines @@
 void AppsContainerView::PrepareToShowApps(AppListFolderItem* folder_item) {
   if (folder_item)
     CreateViewsForFolderTopItemsAnimation(folder_item, false);
 
   // Hide the active folder item until the animation completes.
   if (apps_grid_view_->activated_folder_item_view())
     apps_grid_view_->activated_folder_item_view()->SetVisible(false);
 }
 
 }  // namespace app_list