cros: Expose client_id via chromeosInfoPrivate.

chrome/test/data/extensions/api_test/chromeos_info_private/background.js

 // 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.
 
 var pass = chrome.test.callbackPass;
 var fail = chrome.test.callbackFail;
 
 function getTestFunctionFor(keys, fails) {
   return function generatedTest () {
     // Debug.
@@ skipping 89 matching lines @@
       ));
 }
 
 // Run generated chrome.chromeosInfoPrivate.get() tests.
 var tests = generateTestsForKeys(['hwid',
                                   'customizationId',
                                   'homeProvider',
                                   'initialLocale',
                                   'board',
                                   'isOwner',
+                                  'clientId',
                                   'a11yLargeCursorEnabled',
                                   'a11yStickyKeysEnabled',
                                   'a11ySpokenFeedbackEnabled',
                                   'a11yHighContrastEnabled',
                                   'a11yScreenMagnifierEnabled',
                                   'a11yAutoClickEnabled',
                                   'a11yVirtualKeyboardEnabled',
                                   'sendFunctionKeys',
                                   'timezone',
                                   'supportedTimezones'])
 
 // Add chrome.chromeosInfoPrivate.set() test.
 tests.push(timezoneSetTest);
 tests.push(prefsTest);
 
 chrome.test.runTests(tests);