Teach i18nTemplate.process() to handle <link rel=import> and <template>

ui/file_manager/integration_tests/video_player/check_elements.js

 // Copyright 2015 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.
 
 'use strict';
 
 /**
  * Checks the initial elements in the video player.
  * @return {Promise} Promise to be fulfilled with on success.
  */
 testcase.checkInitialElements = function() {
     var test = openSingleVideo('local', 'downloads', ENTRIES.world);
     return test.then(function(args) {
       var appId = args[0];
       var videoPlayer = args[1];
       return Promise.all([
-        remoteCallVideoPlayer.waitForElement(appId, 'html.i18n-processed'),
+        remoteCallVideoPlayer.waitForElement(appId, 'html[i18n-processed]'),
         remoteCallVideoPlayer.waitForElement(appId, 'div#video-player'),
         remoteCallVideoPlayer.waitForElement(
             appId, '#video-container > video'),
       ]);
     });
 };