Stop foreground depending on background in gyp v2

ui/file_manager/externs/background/import_runner.js

Index: ui/file_manager/externs/background/import_runner.js
diff --git a/ui/file_manager/externs/background/import_runner.js b/ui/file_manager/externs/background/import_runner.js
new file mode 100644
index 0000000000000000000000000000000000000000..b15c2014ab7f0a7a1eac224922ca43683ee07263
--- /dev/null
+++ b/ui/file_manager/externs/background/import_runner.js
@@ -0,0 +1,24 @@
+// 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
+var importer;
+
+/**
+ * Interface providing access to information about active import processes.
+ *
+ * @interface
+ */
+importer.ImportRunner = function() {};
+
+/**
+ * Imports all media identified by scanResult.
+ *
+ * @param {!importer.ScanResult} scanResult
+ * @param {!importer.Destination} destination
+ * @param {!Promise<!DirectoryEntry>} directoryPromise
+ *
+ * @return {!importer.MediaImportHandler.ImportTask} The resulting import task.
+ */
+importer.ImportRunner.prototype.importFromScanResult;