Stop foreground depending on background in gyp v2

ui/file_manager/externs/background/volume_manager_factory.js

Index: ui/file_manager/externs/background/volume_manager_factory.js
diff --git a/ui/file_manager/externs/background/volume_manager_factory.js b/ui/file_manager/externs/background/volume_manager_factory.js
new file mode 100644
index 0000000000000000000000000000000000000000..cebb971fca892ed9fa6cd5f4a4f26b21f2a76845
--- /dev/null
+++ b/ui/file_manager/externs/background/volume_manager_factory.js
@@ -0,0 +1,29 @@
+// 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.
+

[fukino, 2017/05/17 04:58:56]

Do we need this file in addition to background_window_common.js?

[oka, 2017/05/17 08:45:42]

Good catch. Just renamed background_window_common.js.

+var volumeManagerFactory = {
+  /**
+   * Returns the VolumeManager instance asynchronously. If it has not been
+   * created or is under initialization, it will waits for the finish of the
+   * initialization.
+   * @param {function(VolumeManager)=} opt_callback Called with the
+   *     VolumeManager instance. TODO(hirono): Remove the callback and use
+   *     Promise instead.
+   * @return {Promise} Promise to be fulfilled with the volume manager.
+   */
+  getInstance: function(opt_callback) {},
+
+  /**
+   * Returns instance of VolumeManager for debug purpose.
+   * This method returns VolumeManager.instance which may not be initialized.
+   *
+   * @return {VolumeManager} Volume manager.
+   */
+  getInstanceForDebug: function() {},
+
+  /**
+   * Revokes the singleton instance for testing.
+   */
+  revokeInstanceForTesting: function() {}
+};