Make painting app list items more efficient by caching the labels.

ui/app_list/views/app_list_item_view.h

Index: ui/app_list/views/app_list_item_view.h
diff --git a/ui/app_list/views/app_list_item_view.h b/ui/app_list/views/app_list_item_view.h
index a037de2542ea180f72285f44394ef7e98e8ad50b..c2f9d05a40c66033a95d1ad727810087a2ffd414 100644
--- a/ui/app_list/views/app_list_item_view.h
+++ b/ui/app_list/views/app_list_item_view.h
@@ -28,6 +28,7 @@ namespace app_list {
 
 class AppListItemModel;
 class AppsGridView;
+class CachedLabel;
 
 class APP_LIST_EXPORT AppListItemView : public views::CustomButton,
                                         public views::ContextMenuController,
@@ -95,7 +96,7 @@ class APP_LIST_EXPORT AppListItemView : public views::CustomButton,
 
   AppsGridView* apps_grid_view_;  // Owned by views hierarchy.
   views::ImageView* icon_;  // Owned by views hierarchy.
-  views::Label* title_;  // Owned by views hierarchy.
+  CachedLabel* title_;  // Owned by views hierarchy.
 
   scoped_ptr<views::MenuRunner> context_menu_runner_;