Compile more targets in file_manager in gyp v2.

ui/file_manager/file_manager/foreground/js/constants.js

 // Copyright 2017 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.
 
 /**
  * Namespace for common constnats used in Files app.
  * @namespace
  */
 var constants = {};
 
 /**
+ * @const {!Array<string>}
+ */
+constants.ACTIONS_MODEL_METADATA_PREFETCH_PROPERTY_NAMES = ['hosted', 'pinned'];
+
+/**
  * The list of executable file extensions.
  *
  * @const
  * @type {Array<string>}
  */
 constants.EXECUTABLE_EXTENSIONS = Object.freeze([
   '.exe',
   '.lnk',
   '.deb',
   '.dmg',
   '.jar',
   '.msi',
 ]);
+
+/**
+ * These metadata is expected to be cached to accelerate computeAdditional.
+ * See: crbug.com/458915.
+ * @const {!Array<string>}
+ */
+constants.FILE_SELECTION_METADATA_PREFETCH_PROPERTY_NAMES = [
+  'availableOffline',
+  'contentMimeType',
+];
+
+/**
+ * Metadata property names used by FileTable and FileGrid.
+ * These metadata is expected to be cached.
+ * @const {!Array<string>}
+ */
+constants.LIST_CONTAINER_METADATA_PREFETCH_PROPERTY_NAMES = [
+  'availableOffline',
+  'contentMimeType',
+  'customIconUrl',
+  'hosted',
+  'modificationTime',
+  'shared',
+  'size',
+];