Add a flag that lets the webstore show a different UI on app install.

chrome/browser/extensions/extension_webstore_private_apitest.cc

 // Copyright (c) 2011 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/stringprintf.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_webstore_private_api.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 88 matching lines @@
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionWebstorePrivateApiTest,
                        IncorrectManifest2) {
   ui_test_utils::WindowedNotificationObserver observer(
       chrome::NOTIFICATION_EXTENSION_INSTALL_ERROR,
       NotificationService::AllSources());
   ASSERT_TRUE(RunInstallTest("incorrect_manifest2.html", "extension.crx"));
   observer.Wait();
 }
+
+// Tests that we can request an app installed bubble (instead of the default
+// UI when an app is installed).
+IN_PROC_BROWSER_TEST_F(ExtensionWebstorePrivateApiTest,
+                       AppInstallBubble) {
+  ASSERT_TRUE(RunInstallTest("app_install_bubble.html", "app.crx"));
+}