Compile file_manager and eliminate gyp v1 from Files App!

ui/file_manager/externs/background/file_browser_background_full.js

Index: ui/file_manager/externs/background/file_browser_background_full.js
diff --git a/ui/file_manager/externs/background/file_browser_background_full.js b/ui/file_manager/externs/background/file_browser_background_full.js
new file mode 100644
index 0000000000000000000000000000000000000000..97859e916926b8919e1b634c89b9cfa2fab4409b
--- /dev/null
+++ b/ui/file_manager/externs/background/file_browser_background_full.js
@@ -0,0 +1,46 @@
+// 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.
+
+/**
+ * @interface
+ * @extends {FileBrowserBackground}
+ * @struct
+ */
+var FileBrowserBackgroundFull = function() {};
+
+/**
+ * @type {!DriveSyncHandler}
+ */
+FileBrowserBackgroundFull.prototype.driveSyncHandler;
+
+/**
+ * @type {!ProgressCenter}
+ */
+FileBrowserBackgroundFull.prototype.progressCenter;
+
+/**
+ * String assets.
+ * @type {Object<string>}
+ */
+FileBrowserBackgroundFull.prototype.stringData;
+
+/**
+ * @type {FileOperationManager}
+ */
+FileBrowserBackgroundFull.prototype.fileOperationManager;
+
+/**
+ * @type {!importer.ImportRunner}
+ */
+FileBrowserBackgroundFull.prototype.mediaImportHandler;
+
+/**
+ * @type {!importer.MediaScanner}
+ */
+FileBrowserBackgroundFull.prototype.mediaScanner;
+
+/**
+ * @type {!importer.HistoryLoader}
+ */
+FileBrowserBackgroundFull.prototype.historyLoader;