Add the ability to load multiple apps into app_shell.

extensions/browser/guest_view/web_view/web_view_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/browser/guest_view/web_view/web_view_apitest.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
@@ skipping 122 matching lines @@
 void WebViewAPITest::LaunchApp(const std::string& app_location) {
   base::FilePath test_data_dir;
   PathService::Get(DIR_TEST_DATA, &test_data_dir);
   test_data_dir = test_data_dir.AppendASCII(app_location.c_str());
 
   test_config_.SetString(kTestDataDirectory,
                          net::FilePathToFileURL(test_data_dir).spec());
 
   embedded_test_server()->ServeFilesFromDirectory(test_data_dir);
 
-  ASSERT_TRUE(extension_system_->LoadApp(test_data_dir));
-  extension_system_->LaunchApp();
+  const Extension* extension = extension_system_->LoadApp(test_data_dir);
+  ASSERT_TRUE(extension);
+  extension_system_->LaunchApp(extension->id());
 
   ExtensionTestMessageListener launch_listener("LAUNCHED", false);
   ASSERT_TRUE(launch_listener.WaitUntilSatisfied());
 
   embedder_web_contents_ = GetFirstAppWindowWebContents();
 }
 
 content::WebContents* WebViewAPITest::GetFirstAppWindowWebContents() {
   const AppWindowRegistry::AppWindowList& app_window_list =
       AppWindowRegistry::Get(browser_context_)->app_windows();
@@ skipping 547 matching lines @@
 // object, on the webview element, and hanging directly off webview.
 IN_PROC_BROWSER_TEST_F(WebViewAPITest, TestWebRequestAPIExistence) {
   RunTest("testWebRequestAPIExistence", "web_view/apitest");
 }
 
 IN_PROC_BROWSER_TEST_F(WebViewAPITest, TestWebRequestAPIGoogleProperty) {
   RunTest("testWebRequestAPIGoogleProperty", "web_view/apitest");
 }
 
 }  // namespace extensions