Fixed file/directory url resolution for external mount point provider.

webkit/fileapi/file_system_operation.h

Index: webkit/fileapi/file_system_operation.h
===================================================================
--- webkit/fileapi/file_system_operation.h	(revision 82172)
+++ webkit/fileapi/file_system_operation.h	(working copy)
@@ -84,6 +84,7 @@
       const GURL& path,
       int file_flags,
       base::ProcessHandle peer_handle);
+  void GetLocalPath(const GURL& path);
 
   // Try to cancel the current operation [we support cancelling write or
   // truncate only].  Report failure for the current operation, then tell the
@@ -138,6 +139,8 @@
       base::PlatformFileError rv,
       base::PassPlatformFile file,
       bool created);
+  void DidGetLocalPath(base::PlatformFileError rv,
+                       const FilePath& local_path);
 
   // Helper for Write().
   void OnFileOpenedForWrite(
@@ -194,6 +197,7 @@
     kOperationTruncate,
     kOperationTouchFile,
     kOperationOpenFile,
+    kOperationGetLocalPath,
     kOperationCancel,
   };