Add script files of the separated Gallery.app.

chrome/browser/resources/file_manager/foreground/js/metadata/metadata_cache.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.
 
 'use strict';
 
 /**
  * MetadataCache is a map from Entry to an object containing properties.
  * Properties are divided by types, and all properties of one type are accessed
  * at once.
@@ skipping 857 matching lines @@
  * fetchedMedia: { same fields here }
  * @constructor
  */
 function ContentProvider() {
   MetadataProvider.call(this);
 
   // Pass all URLs to the metadata reader until we have a correct filter.
   this.urlFilter_ = /.*/;
 
   var path = document.location.pathname;
-  var workerPath = document.location.origin +
-      path.substring(0, path.lastIndexOf('/') + 1) +
-      'foreground/js/metadata/metadata_dispatcher.js';
-
-  this.dispatcher_ = new SharedWorker(workerPath).port;
-  this.dispatcher_.start();
-
-  this.dispatcher_.onmessage = this.onMessage_.bind(this);
-  this.dispatcher_.postMessage({verb: 'init'});
+  var dispatcher = new SharedWorker(ContentProvider.WORKER_SCRIPT).port;
+  dispatcher.start();

[yoshiki, 2014/04/23 07:08:39]

I think, it's better to put start() after adding message handler.

[hirono, 2014/04/23 08:13:15]

Done.

+  dispatcher.onmessage = this.onMessage_.bind(this);
+  dispatcher.postMessage({verb: 'init'});
+  this.dispatcher_ = dispatcher;
 
   // Initialization is not complete until the Worker sends back the
   // 'initialized' message.  See below.
   this.initialized_ = false;
 
   // Map from Entry.toURL() to callback.
   // Note that simultaneous requests for same url are handled in MetadataCache.
   this.callbacks_ = {};
 }
 
+/**
+ * Path of a worker script.
+ * @type {string}

[yoshiki, 2014/04/23 07:08:39]

@const

[hirono, 2014/04/23 08:13:15]

Done.

+ */
+ContentProvider.WORKER_SCRIPT =
+    'chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj/' +
+    'foreground/js/metadata_dispatcher.js';
+
 ContentProvider.prototype = {
   __proto__: MetadataProvider.prototype
 };
 
 /**
  * @param {Entry} entry The entry.
  * @return {boolean} Whether this provider supports the entry.
  */
 ContentProvider.prototype.supportsEntry = function(entry) {
   return entry.toURL().match(this.urlFilter_);
@@ skipping 135 matching lines @@
 
 /**
  * Handles the 'log' message from the worker.
  * @param {Array.<*>} arglist Log arguments.
  * @private
  */
 ContentProvider.prototype.onLog_ = function(arglist) {
   if (MetadataCache.log)  // Avoid log spam by default.
     console.log.apply(console, ['metadata:'].concat(arglist));
 };