Use app list item shadow for app list folders.

ui/app_list/demo/app_list_demo_views.cc

 // Copyright 2014 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 "base/bind.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/content_switches.h"
@@ skipping 58 matching lines @@
                                      false /* border_accepts_events */);
 
   // Populate some apps.
   GetTestModel()->PopulateApps(kInitialItems);
   app_list::AppListItemList* item_list = GetTestModel()->top_level_item_list();
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   gfx::Image test_image = rb.GetImageNamed(IDR_DEFAULT_FAVICON_32);
   for (size_t i = 0; i < item_list->item_count(); ++i) {
     app_list::AppListItem* item = item_list->item_at(i);
     // Alternate images with shadows and images without.
-    item->SetIcon(*test_image.ToImageSkia(), i & 1);
+    item->SetIcon(*test_image.ToImageSkia());
   }
   return view_;
 }
 
 void DemoAppListViewDelegate::Dismiss() {
   view_->GetWidget()->Close();
 }
 
 void DemoAppListViewDelegate::ViewClosing() {
   base::MessageLoop* message_loop = base::MessageLoopForUI::current();
@@ skipping 33 matching lines @@
   content::InitializeSandboxInfo(&sandbox_info);
   ui::ViewsContentClient views_content_client(instance, &sandbox_info);
 #else
 int main(int argc, const char** argv) {
   ui::ViewsContentClient views_content_client(argc, argv);
 #endif
 
   views_content_client.set_task(base::Bind(&ShowAppList));
   return views_content_client.RunMain();
 }