(WIP) Use generator to generate externs for chrome.fileManagerPrivate API.

ui/file_manager/file_manager/foreground/js/quick_view_controller.js

 // Copyright (c) 2016 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.
 
 /**
  * Controller for QuickView.
  * This should be initialized with |init_| method.
  *
  * @param {!MetadataModel} metadataModel File system metadata.
  * @param {!FileSelectionHandler} selectionHandler
@@ skipping 237 matching lines @@
   if (this.quickView_ && this.quickView_.isOpened()) {
     assert(this.entries_.length > 0);
     var entry = this.entries_[0];
     this.quickViewModel_.setSelectedEntry(entry);
     this.display_();
   }
 };
 
 /**
  * @param {!FileEntry} entry
- * @return {!Promise<!Array<!FileTask>>}
+ * @return {!Promise<!Array<!chrome.fileManagerPrivate.FileTask>>}
  * @private
  */
 QuickViewController.prototype.getAvailableTasks_ = function(entry) {
   return this.taskController_.getFileTasks().then(function(tasks) {
     return tasks.getTaskItems();
   });
 };
 
 /**
  * Update quick view using current entries.
@@ skipping 15 matching lines @@
   var entry =
       (/** @type {!FileEntry} */ (this.quickViewModel_.getSelectedEntry()));
   assert(entry);
   this.quickViewUma_.onEntryChanged(entry);
   return Promise
       .all([
         this.metadataModel_.get([entry], ['thumbnailUrl']),
         this.getAvailableTasks_(entry)
       ])
       .then(function(values) {
-        var items = (/**@type{Array<MetadataItem>}*/ (values[0]));
-        var tasks = (/**@type{!Array<!FileTask>}*/ (values[1]));
+        var items = /**@type{Array<MetadataItem>}*/ (values[0]);
+        var tasks = /**@type{!Array<!chrome.fileManagerPrivate.FileTask>}*/ (
+            values[1]);
         return this.onMetadataLoaded_(entry, items, tasks);
       }.bind(this))
       .catch(console.error);
 };
 
 /**
  * Update quick view using file entry and loaded metadata and tasks.
  *
  * @param {!FileEntry} entry
  * @param {Array<MetadataItem>} items
- * @param {!Array<!FileTask>} tasks
+ * @param {!Array<!chrome.fileManagerPrivate.FileTask>} tasks
  * @private
  */
 QuickViewController.prototype.onMetadataLoaded_ = function(
     entry, items, tasks) {
   return this.getQuickViewParameters_(entry, items, tasks)
       .then(function(params) {
         this.quickView_.type = params.type || '';
         this.quickView_.filePath = params.filePath || '';
         this.quickView_.hasTask = params.hasTask || false;
         this.quickView_.contentUrl = params.contentUrl || '';
@@ skipping 13 matching lines @@
  *   audioArtwork: (string|undefined),
  *   autoplay: (boolean|undefined),
  *   browsable: (boolean|undefined),
  * }}
  */
 var QuickViewParams;
 
 /**
  * @param {!FileEntry} entry
  * @param {Array<MetadataItem>} items
- * @param {!Array<!FileTask>} tasks
+ * @param {!Array<!chrome.fileManagerPrivate.FileTask>} tasks
  * @return !Promise<!QuickViewParams>
  *
  * @private
  */
 QuickViewController.prototype.getQuickViewParameters_ = function(
     entry, items, tasks) {
   var item = items[0];
   var type = FileType.getType(entry).type;
 
   /** @type {!QuickViewParams} */
@@ skipping 86 matching lines @@
  *
  * @param {string} url Thumbnail url
  * @return Promise<{{status: string, data:string, width:number, height:number}}>
  * @private
  */
 QuickViewController.prototype.loadThumbnailFromDrive_ = function(url) {
   return new Promise(function(resolve) {
     ImageLoaderClient.getInstance().load(url, resolve)
   });
 };