Handling file actions in only one instance of file manager.

chrome/browser/resources/file_manager/js/file_manager.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.
 
 // Setting the src of an img to an empty string can crash the browser, so we
 // use an empty 1x1 gif instead.
 const EMPTY_IMAGE_URI = 'data:image/gif;base64,'
         + 'R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw%3D%3D';
 
 var g_slideshow_data = null;
@@ skipping 1638 matching lines @@
    */
   FileManager.prototype.onTasksFound_ = function(selection, tasksList) {
     this.taskButtons_.innerHTML = '';
 
     for (var i = 0; i < tasksList.length; i++) {
       var task = tasksList[i];
 
       // Tweak images, titles of internal tasks.
       var task_parts = task.taskId.split('|');
       if (task_parts[0] == this.getExtensionId_()) {
+        task.internal = true;
         if (task_parts[1] == 'preview') {
           // TODO(serya): This hack needed until task.iconUrl get working
           //              (see GetFileTasksFileBrowserFunction::RunImpl).
           task.iconUrl =
               chrome.extension.getURL('images/icon_preview_16x16.png');
           task.title = str('PREVIEW_IMAGE');
         } else if (task_parts[1] == 'edit') {
           task.iconUrl =
               chrome.extension.getURL('images/icon_preview_16x16.png');
           task.title = 'Edit';
@@ skipping 114 matching lines @@
     }
 
     chrome.fileBrowserPrivate.getMountPoints(onMountPointsFound);
   };
 
   FileManager.prototype.getExtensionId_ = function() {
     return chrome.extension.getURL('').split('/')[2];
   };
 
   FileManager.prototype.onTaskButtonClicked_ = function(event) {
-    chrome.fileBrowserPrivate.executeTask(event.srcElement.task.taskId,
+    var task = event.srcElement.task;
+    if (task.internal) {
+      // For internal tasks call the handler directly to avoid being handled
+      // multiple times.
+      var taskId = task.taskId.split('|')[1];
+      this.onFileTaskExecute_(taskId, {entries: this.selection.entries});
+      return;
+    }
+    chrome.fileBrowserPrivate.executeTask(task.taskId,
                                           this.selection.urls);
   };
 
   /**
    * Event handler called when some volume was mounted or unmouted.
    */
   FileManager.prototype.onMountCompleted_ = function(event) {
     var self = this;
     chrome.fileBrowserPrivate.getMountPoints(function(mountPoints) {
       self.mountPoints_ = mountPoints;
@@ skipping 1462 matching lines @@
 
     if (msg) {
       console.log('no no no');
       this.alert.show(msg, onAccept);
       return false;
     }
 
     return true;
   };
 })();