drive: Add a very basic browser test for the autocomplete feature

chrome/browser/chromeos/extensions/file_manager/file_manager_browsertest.cc

 // Copyright (c) 2013 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.
 
 // Browser test for basic Chrome OS file manager functionality:
 //  - The file list is updated when a file is added externally to the Downloads
 //    folder.
 //  - Selecting a file and copy-pasting it with the keyboard copies the file.
 //  - Selecting a file and pressing delete deletes it.
 
@@ skipping 689 matching lines @@
 }
 
 IN_PROC_BROWSER_TEST_P(FileManagerBrowserDriveTest, TestOpenRecent) {
   drive_test_util::WaitUntilDriveMountPointIsAdded(browser()->profile());
 
   ResultCatcher catcher;
   StartTest("openSidebarRecent");
   ASSERT_TRUE(catcher.GetNextResult()) << catcher.message();
 }
 
+IN_PROC_BROWSER_TEST_P(FileManagerBrowserDriveTest, TestAutocomplete) {
+  drive_test_util::WaitUntilDriveMountPointIsAdded(browser()->profile());
+
+  ResultCatcher catcher;
+  StartTest("autocomplete");
+  ASSERT_TRUE(catcher.GetNextResult()) << catcher.message();
+}
+
 }  // namespace