Improve UI for unpacked extensions failing to load

chrome/browser/ui/webui/extensions/extensions_ui.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/webui/extensions/extensions_ui.h"
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/extensions/command_handler.h"
 #include "chrome/browser/ui/webui/extensions/extension_error_handler.h"
+#include "chrome/browser/ui/webui/extensions/extension_loader_handler.h"
 #include "chrome/browser/ui/webui/extensions/extension_settings_handler.h"
 #include "chrome/browser/ui/webui/extensions/install_extension_handler.h"
 #include "chrome/browser/ui/webui/extensions/pack_extension_handler.h"
 #include "chrome/browser/ui/webui/metrics_handler.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/browser/web_ui_data_source.h"
 #include "grit/browser_resources.h"
 #include "grit/theme_resources.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 37 matching lines @@
 
   CommandHandler* commands_handler = new CommandHandler(profile);
   commands_handler->GetLocalizedValues(source);
   web_ui->AddMessageHandler(commands_handler);
 
   ExtensionErrorHandler* extension_error_handler =
       new ExtensionErrorHandler(profile);
   extension_error_handler->GetLocalizedValues(source);
   web_ui->AddMessageHandler(extension_error_handler);
 
+  ExtensionLoaderHandler* extension_loader_handler =
+      new ExtensionLoaderHandler(profile);
+  extension_loader_handler->GetLocalizedValues(source);
+  web_ui->AddMessageHandler(extension_loader_handler);
+
   InstallExtensionHandler* install_extension_handler =
       new InstallExtensionHandler();
   install_extension_handler->GetLocalizedValues(source);
   web_ui->AddMessageHandler(install_extension_handler);
 
 #if defined(OS_CHROMEOS)
   chromeos::KioskAppsHandler* kiosk_app_handler =
       new chromeos::KioskAppsHandler();
   kiosk_app_handler->GetLocalizedValues(source);
   web_ui->AddMessageHandler(kiosk_app_handler);
 #endif
 
   web_ui->AddMessageHandler(new MetricsHandler());
 
   content::WebUIDataSource::Add(profile, source);
 }
 
 ExtensionsUI::~ExtensionsUI() {}
 
 // static
 base::RefCountedMemory* ExtensionsUI::GetFaviconResourceBytes(
     ui::ScaleFactor scale_factor) {
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   return rb.LoadDataResourceBytesForScale(IDR_EXTENSIONS_FAVICON, scale_factor);
 }
 
 }  // namespace extensions