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

ui/app_list/views/apps_grid_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/apps_grid_view.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
 
@@ skipping 823 matching lines @@
   for (int i = start; i < end; i++) {
     AppListItemView* v = static_cast<AppListItemView*>(view_model_.view_at(i));
     v->Prerender();
   }
 }
 
 bool AppsGridView::IsAnimatingView(views::View* view) {
   return bounds_animator_.IsAnimating(view);
 }
 
-gfx::Size AppsGridView::GetPreferredSize() {
+gfx::Size AppsGridView::GetPreferredSize() const {
   const gfx::Insets insets(GetInsets());
   const gfx::Size tile_size = gfx::Size(kPreferredTileWidth,
                                         kPreferredTileHeight);
   const int page_switcher_height =
       page_switcher_view_->GetPreferredSize().height();
   return gfx::Size(
       tile_size.width() * cols_ + insets.width(),
       tile_size.height() * rows_per_page_ +
           page_switcher_height + insets.height());
 }
@@ skipping 1293 matching lines @@
 void AppsGridView::SetAsFolderDroppingTarget(const Index& target_index,
                                              bool is_target_folder) {
   AppListItemView* target_view =
       static_cast<AppListItemView*>(
           GetViewAtSlotOnCurrentPage(target_index.slot));
   if (target_view)
     target_view->SetAsAttemptedFolderTarget(is_target_folder);
 }
 
 }  // namespace app_list