Added views::ViewModelT<T>, a type-safe template version of ViewModel.

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 744 matching lines @@
   if (folder_delegate_ && !IsDraggingForReparentInHiddenGridView())
     folder_delegate_->UpdateFolderViewBackground(false);
 }
 
 void AppsGridView::StopPageFlipTimer() {
   page_flip_timer_.Stop();
   page_flip_target_ = -1;
 }
 
 AppListItemView* AppsGridView::GetItemViewAt(int index) const {
-  return static_cast<AppListItemView*>(view_model_.view_at(index));
+  return view_model_.view_at(index);
 }
 
 void AppsGridView::SetTopItemViewsVisible(bool visible) {
   int top_item_count = std::min(static_cast<int>(kNumFolderTopItems),
                                 view_model_.view_size());
   for (int i = 0; i < top_item_count; ++i)
     GetItemViewAt(i)->icon()->SetVisible(visible);
 }
 
 void AppsGridView::ScheduleShowHideAnimation(bool show) {
@@ skipping 274 matching lines @@
   const int existing_items = item_list_ ? item_list_->item_count() : 0;
   const int available_slots =
       tiles_per_page() - existing_items % tiles_per_page();
   const int desired = model_->status() == AppListModel::STATUS_SYNCING ?
       available_slots : 0;
 
   if (pulsing_blocks_model_.view_size() == desired)
     return;
 
   while (pulsing_blocks_model_.view_size() > desired) {
-    PulsingBlockView* view = GetPulsingBlockViewAt(0);
+    PulsingBlockView* view = pulsing_blocks_model_.view_at(0);
     pulsing_blocks_model_.Remove(0);
     delete view;
   }
 
   while (pulsing_blocks_model_.view_size() < desired) {
     PulsingBlockView* view = new PulsingBlockView(GetTotalTileSize(), true);
     pulsing_blocks_model_.Add(view, 0);
     AddChildView(view);
   }
 }
 
-PulsingBlockView* AppsGridView::GetPulsingBlockViewAt(int index) const {
-  return static_cast<PulsingBlockView*>(pulsing_blocks_model_.view_at(index));
-}
-
 AppListItemView* AppsGridView::CreateViewForItemAtIndex(size_t index) {
   // The drag_view_ might be pending for deletion, therefore view_model_
   // may have one more item than item_list_.
   DCHECK_LE(index, item_list_->item_count());
   AppListItemView* view = new AppListItemView(this,
                                               item_list_->item_at(index));
   view->SetPaintToLayer(true);
   view->SetFillsBoundsOpaquely(false);
   return view;
 }
@@ skipping 1065 matching lines @@
 
 void AppsGridView::SetAsFolderDroppingTarget(const Index& target_index,
                                              bool is_target_folder) {
   AppListItemView* target_view =
       GetViewDisplayedAtSlotOnCurrentPage(target_index.slot);
   if (target_view)
     target_view->SetAsAttemptedFolderTarget(is_target_folder);
 }
 
 }  // namespace app_list