Experimental app list: "All apps" button has a folder-like icon.

ui/app_list/views/start_page_view.cc

Index: ui/app_list/views/start_page_view.cc
diff --git a/ui/app_list/views/start_page_view.cc b/ui/app_list/views/start_page_view.cc
index dcf9c1d609a71b4731830e5f606754202a6aefda..2c30478826203cffa7fc259a61c9b25cdeae432d 100644
--- a/ui/app_list/views/start_page_view.cc
+++ b/ui/app_list/views/start_page_view.cc
@@ -144,8 +144,10 @@ void StartPageView::InitTilesContainer() {
   }
 
   // Also add a special "all apps" button to the end of the container.
-  all_apps_button_ =
-      new AllAppsTileItemView(app_list_main_view_->contents_view());
+  all_apps_button_ = new AllAppsTileItemView(
+      app_list_main_view_->contents_view(),
+      view_delegate_->GetModel()->top_level_item_list());
+  all_apps_button_->UpdateIcon();
   tiles_container_->AddChildView(all_apps_button_);
 }