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

ui/app_list/views/contents_view.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 "ui/app_list/views/contents_view.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "ui/app_list/app_list_constants.h"
@@ skipping 191 matching lines @@
 
 void ContentsView::ShowFolderContent(AppListFolderItem* item) {
   apps_container_view_->ShowActiveFolder(item);
 }
 
 void ContentsView::Prerender() {
   const int selected_page = std::max(0, pagination_model_->selected_page());
   apps_container_view_->apps_grid_view()->Prerender(selected_page);
 }
 
-gfx::Size ContentsView::GetPreferredSize() {
+gfx::Size ContentsView::GetPreferredSize() const {
   const gfx::Size container_size = GetAppsContainerView(view_model_.get())->
       apps_grid_view()->GetPreferredSize();
   const gfx::Size results_size =
       GetSearchResultListView(view_model_.get())->GetPreferredSize();
 
   int width = std::max(container_size.width(), results_size.width());
   int height = std::max(container_size.height(), results_size.height());
   return gfx::Size(width, height);
 }
 
@@ skipping 89 matching lines @@
     if (!pagination_model_->has_transition()) {
       pagination_model_->SelectPageRelative(offset > 0 ? -1 : 1,
                                             true);
     }
     event->SetHandled();
     event->StopPropagation();
   }
 }
 
 }  // namespace app_list