New API to copy syncfs folder to localfs.

chrome/common/extensions/api/developer_private.idl

Index: chrome/common/extensions/api/developer_private.idl
diff --git a/chrome/common/extensions/api/developer_private.idl b/chrome/common/extensions/api/developer_private.idl
index 57307e3791961eb4a02017967a3d02a9e8594f1a..738ad4e11aad4fb31409192103f1ac8f6bc4a54a 100644
--- a/chrome/common/extensions/api/developer_private.idl
+++ b/chrome/common/extensions/api/developer_private.idl
@@ -175,14 +175,10 @@ namespace developerPrivate {
     // Load a user selected unpacked item
     static void loadUnpacked(optional VoidCallback callback);
 
-    // Copies the syncfs folder for the extension to local disk.
-    static void exportSyncfsFolderToLocalfs(DOMString folder_name,
-                                            optional VoidCallback callback);
-
-    // Loads the unpacked app / extension.
-    // |callback| called with itemId of the loaded item.
-    static void loadProject(DOMString project_name,
-                            PathCallback callback);
+    // Copies the syncfs directory for the extension to local disk.
+    // Loads an extension / app from a given |directory|
+    static void loadDirectory([instanceOf=DirectoryEntry] object directory,
+                        PathCallback callback);
 
     // Open Dialog to browse to an entry.
     // |select_type| : Select a file or a folder.