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

ui/file_manager/video_player/js/video_player.js

 // Copyright 2014 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.
 
 /**
  * @param {!HTMLElement} playerContainer Main container.
  * @param {!HTMLElement} videoContainer Container for the video element.
  * @param {!HTMLElement} controlsContainer Container for video controls.
  * @constructor
  * @struct
@@ skipping 15 matching lines @@
   var currentWindow = chrome.app.window.current();
   currentWindow.onFullscreened.addListener(
       this.onFullScreenChanged.bind(this, true));
   currentWindow.onRestored.addListener(
       this.onFullScreenChanged.bind(this, false));
   document.addEventListener('keydown', function(e) {
     this.inactivityWatcher_.kick();
     switch (util.getKeyModifiers(e) + e.key) {
       // Handle debug shortcut keys.
       case 'Ctrl-Shift-I': // Ctrl+Shift+I
-        chrome.fileManagerPrivate.openInspector('normal');
+        chrome.fileManagerPrivate.openInspector(
+            chrome.fileManagerPrivate.InspectionType.NORMAL);
         break;
       case 'Ctrl-Shift-J': // Ctrl+Shift+J
-        chrome.fileManagerPrivate.openInspector('console');
+        chrome.fileManagerPrivate.openInspector(
+            chrome.fileManagerPrivate.InspectionType.CONSOLE);
         break;
       case 'Ctrl-Shift-C': // Ctrl+Shift+C
-        chrome.fileManagerPrivate.openInspector('element');
+        chrome.fileManagerPrivate.openInspector(
+            chrome.fileManagerPrivate.InspectionType.ELEMENT);
         break;
       case 'Ctrl-Shift-B': // Ctrl+Shift+B
-        chrome.fileManagerPrivate.openInspector('background');
+        chrome.fileManagerPrivate.openInspector(
+            chrome.fileManagerPrivate.InspectionType.BACKGROUND);
         break;
 
       case ' ': // Space
       case 'k':
       case 'MediaPlayPause':
         if (!e.target.classList.contains('menu-button'))
           this.togglePlayStateWithFeedback();
         break;
       case 'Escape':
         util.toggleFullScreen(
@@ skipping 757 matching lines @@
   return new Promise(function(fulfill, reject) {
     util.URLsToEntries(window.appState.items, function(entries) {
       metrics.recordOpenVideoPlayerAction();
       metrics.recordNumberOfOpenedFiles(entries.length);
 
       player.prepare(entries);
       player.playFirstVideo(player, fulfill);
     }.wrap());
   }.wrap());
 }.wrap());