[win] Add a progress bar in the app launcher for app installs.

chrome/browser/ui/app_list/extension_app_item.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 "chrome/browser/ui/app_list/extension_app_item.h"
 
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/extensions/context_menu_matcher.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 190 matching lines @@
 #if defined(OS_CHROMEOS)
   return false;
 #else
   const Extension* extension = GetExtension();
   return extension && !extension->is_platform_app();
 #endif
 }
 
 void ExtensionAppItem::Reload() {
   const Extension* extension = GetExtension();
-  // If the extension isn't there, show the 'extension is installing' UI.
-  if (!extension) {
+  bool is_installing = !extension;
+  SetIsInstalling(is_installing);
+  if (is_installing) {
     SetTitle(extension_name_);
     UpdateIcon();
     return;
   }
   SetTitle(extension->name());
   LoadImage(extension);
 }
 
 syncer::StringOrdinal ExtensionAppItem::GetPageOrdinal() const {
   return GetExtensionSorting(profile_)->GetPageOrdinal(extension_id_);
@@ skipping 363 matching lines @@
     }
 
     context_menu_model_->AddItemWithStringId(UNINSTALL,
                                              extension->is_platform_app() ?
                                                  IDS_APP_LIST_UNINSTALL_ITEM :
                                                  IDS_EXTENSIONS_UNINSTALL);
   }
 
   return context_menu_model_.get();
 }