Add browser test to the sharing dialog feature in Files.app.

chrome/browser/resources/file_manager/js/share_client.js

 // Copyright 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.
 
 'use strict';
 
 /**
  * @param {WebView} webView Web View tag.
  * @param {string} url Share Url for an entry.
  * @param {ShareClient.Observer} observer Observer instance.
@@ skipping 59 matching lines @@
  */
 ShareClient.Observer.prototype.onClosed = function() {
 };
 
 /**
  * Handles messages from the embedded dialog.
  * @param {Event} e Message event.
  * @private
  */
 ShareClient.prototype.onMessage_ = function(e) {
-  if (e.origin != ShareClient.SHARE_TARGET)
+  if (e.origin != ShareClient.SHARE_TARGET && !window.IN_TEST)
     return;
+
   var data = JSON.parse(e.data);
   switch (data.type) {
     case 'resize':
       this.observer_.onResized(data.args.width,
                                data.args.height,
                                this.postMessage_.bind(this, 'resizeComplete'));
       break;
     case 'prepareForVisible':
       this.postMessage_('prepareComplete');
       if (!this.loaded_) {
@@ skipping 32 matching lines @@
  * @param {string} type Message type.
  * @param {Object=} opt_args Optional arguments.
  * @private
  */
 ShareClient.prototype.postMessage_ = function(type, opt_args) {
   var message = {
     type: type,
     args: opt_args
   };
   this.webView_.contentWindow.postMessage(
-      JSON.stringify(message), ShareClient.SHARE_TARGET);
+      JSON.stringify(message),
+      !window.IN_TEST ? ShareClient.SHARE_TARGET : '*');
 };
 
 /**
  * Loads the embedded dialog. Can be called only one.
  */
 ShareClient.prototype.load = function() {
   if (this.loading_ || this.loaded_)
     throw new Error('Already loaded.');
   this.loading_ = true;
 
@@ skipping 13 matching lines @@
       'loadabort', this.onLoadAbortBound_);
   this.webView_.stop();
 };
 
 /**
  * Cleans the dialog by removing all handlers.
  */
 ShareClient.prototype.dispose = function() {
   this.abort();
 };