[Extensions] Make chrome://extensions use developerPrivate for unpacked loading

chrome/common/extensions/api/developer_private.idl

 // 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.
 
 // developerPrivate API.
 // This is a private API exposing developing and debugging functionalities for
 // apps and extensions.
 namespace developerPrivate {
 
   enum ItemType {
@@ skipping 60 matching lines @@
   dictionary InspectOptions {
     DOMString extension_id;
     DOMString render_process_id;
     DOMString render_view_id;
     boolean incognito;
   };
 
   dictionary ReloadOptions {
     // If false, an alert dialog will show in the event of a reload error.
     // Defaults to false.
-    boolean failQuietly;
+    boolean? failQuietly;
+  };
+
+  dictionary LoadUnpackedOptions {
+    // If false, an alert dialog will show in the event of a reload error.
+    // Defaults to false.
+    boolean? failQuietly;
   };
 
   enum PackStatus {
     SUCCESS,
     ERROR,
     WARNING
   };
 
   enum FileType {
     LOAD,
@@ skipping 148 matching lines @@
                        optional VoidCallback callback);
 
     // Allows / Disallows an extension to run in incognito mode.
     // |extensionId| : The id of the extension.
     // |allow| : Whether or not the extension should be allowed incognito.
     static void allowIncognito(DOMString extensionId,
                                boolean allow,
                                optional VoidCallback callback);
 
     // Loads a user-selected unpacked item.
-    static void loadUnpacked(optional VoidCallback callback);
+    // |options| : Additional configuration parameters.
+    static void loadUnpacked(optional LoadUnpackedOptions options,
+                             optional VoidCallback callback);
 
     // Loads an extension / app.
     // |directory| : The directory to load the extension from.
     static void loadDirectory(
         [instanceOf=DirectoryEntry] object directory,
         PathCallback callback);
 
     // Open Dialog to browse to an entry.
     // |selectType| : Select a file or a folder.
     // |fileType| : Required file type. For example, pem type is for private
@@ skipping 24 matching lines @@
     // Open the developer tools to focus on a particular error.
     static void openDevTools(OpenDevToolsProperties properties);
   };
 
   interface Events {
     // Fired when a item state is changed.
     static void onItemStateChanged(EventData response);
   };
 
 };