Add the ability to load multiple apps into app_shell.

extensions/shell/test/shell_apitest.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 "extensions/shell/test/shell_apitest.h"
 
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "extensions/common/extension_paths.h"
 #include "extensions/shell/browser/shell_extension_system.h"
 #include "extensions/test/result_catcher.h"
 
 namespace extensions {
 
 ShellApiTest::ShellApiTest() {
 }
 
 ShellApiTest::~ShellApiTest() {
 }
 
 bool ShellApiTest::RunAppTest(const std::string& app_dir) {
   base::FilePath test_data_dir;
   PathService::Get(extensions::DIR_TEST_DATA, &test_data_dir);
   test_data_dir = test_data_dir.AppendASCII(app_dir);
   ResultCatcher catcher;
 
-  bool loaded = extension_system_->LoadApp(test_data_dir);
-  if (!loaded)
+  const Extension* extension = extension_system_->LoadApp(test_data_dir);
+  if (!extension)
     return false;
 
-  extension_system_->LaunchApp();
+  extension_system_->LaunchApp(extension->id());
 
   if (!catcher.GetNextResult()) {
     message_ = catcher.message();
     return false;
   }
 
   return true;
 }
 
 }  // namespace extensions