[File Manager] Better message when trying to open unsupported files

chrome/browser/resources/file_manager/js/file_tasks.js

 // Copyright (c) 2012 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.
 
 /**
  * This object encapsulates everything related to tasks execution.
  * @param {FileManager} fileManager FileManager instance.
  * @param {Array.<string>} urls List of file urls.
  */
 function FileTasks(fileManager, urls) {
   this.fileManager_ = fileManager;
   this.urls_ = urls;
   this.tasks_ = null;
   this.defaultTask_ = null;
 
   /**
    * List of invocations to be called once tasks are available.
    */
   this.pendingInvocations_ = [];
 
   if (urls.length > 0)
     chrome.fileBrowserPrivate.getFileTasks(urls, this.onTasks_.bind(this));
 }
 
 /**
+* Location of the Chrome Web Store.
+*/
+FileTasks.CHROME_WEB_STORE_URL = 'https://chrome.google.com/webstore';
+
+/**
 * Location of the FAQ about the file actions.
 */
 FileTasks.NO_ACTION_FOR_FILE_URL = 'http://support.google.com/chromeos/bin/' +
     'answer.py?answer=1700055&topic=29026&ctx=topic';
 
 /**
  * Callback when tasks found.
  * @param {Array.<Object>} tasks The tasks.
  * @private
  */
@@ skipping 77 matching lines @@
   // We don't have tasks, so try to show a file in a browser tab.
   // We only do that for single selection to avoid confusion.
   if (this.urls_.length == 1) {
     var callback = function(success) {
       if (!success) {
         var filename = decodeURIComponent(this.urls_[0]);
         if (filename.indexOf('/') != -1)
           filename = filename.substr(filename.lastIndexOf('/') + 1);
 
         var text = loadTimeData.getStringF('NO_ACTION_FOR_FILE',
+                                           FileTasks.CHROME_WEB_STORE_URL,
                                            FileTasks.NO_ACTION_FOR_FILE_URL);
         this.fileManager_.alert.showHtml(filename, text, function() {});
       }
     }.bind(this);
 
     this.checkAvailability_(function() {
       chrome.fileBrowserPrivate.viewFiles(this.urls_, 'default', callback);
     }.bind(this));
   }
 
@@ skipping 362 matching lines @@
     return this;
   };
 };
 
 FileTasks.decorate('display');
 FileTasks.decorate('updateMenuItem');
 FileTasks.decorate('execute');
 FileTasks.decorate('executeDefault');
 FileTasks.decorate('getExternals');