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

chrome/test/data/extensions/api_test/file_manager_browsertest/test_cases.js

 // 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.
 
 /**
  * Expected files before tests are performed.
  * @type {Array.<Array.<string>>}
  * @const
  */
 var EXPECTED_FILES_BEFORE = [
@@ skipping 155 matching lines @@
         'fakeMouseClick', appId, ['[volume-type-icon=drive_recent]'],
         function(result) {
           chrome.test.assertFalse(!result);
           callRemoteTestUtil('waitForFileListChange',
                              appId,
                              [EXPECTED_FILES_BEFORE.length],
                              onFileListChange);
         });
   });
 };
+
+/**
+ * Tests autocomplete with a query 'hello'. This test is only available for
+ * Drive.
+ */
+testcase.autocomplete = function() {
+  var EXPECTED_AUTOCOMPLETE_LIST = [
+    '\'hello\' - search Drive\n',
+    'hello.txt\n',
+  ];
+
+  var onAutocompleteListShown = chrome.test.callbackPass(
+      function(autocompleteList) {
+        chrome.test.assertEq(EXPECTED_AUTOCOMPLETE_LIST, autocompleteList);
+      });
+
+  setupAndWaitUntilReady('/drive/root', function(appId, list) {
+    callRemoteTestUtil('performAutocompleteAndWait',
+                       appId,
+                       ['hello', EXPECTED_AUTOCOMPLETE_LIST.length],
+                       onAutocompleteListShown);
+  });
+};