PPAPI: Add new PPB_FileRef.MakeDirectory to support exclusive operation

ppapi/proxy/file_ref_resource.cc

 // Copyright 2013 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.
 
 #include "ppapi/proxy/file_ref_resource.h"
 
 #include "ppapi/c/pp_directory_entry.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/proxy/ppapi_messages.h"
@@ skipping 111 matching lines @@
   parent_info.display_name = GetNameForInternalFilePath(parent_path);
   parent_info.file_system_plugin_resource =
       create_info_.file_system_plugin_resource;
 
   return (new FileRefResource(connection(),
                               pp_instance(),
                               parent_info))->GetReference();
 }
 
 int32_t FileRefResource::MakeDirectory(
-    PP_Bool make_ancestors,
+    int32_t make_directory_flags,
     scoped_refptr<TrackedCallback> callback) {
   Call<PpapiPluginMsg_FileRef_MakeDirectoryReply>(
       BROWSER,
-      PpapiHostMsg_FileRef_MakeDirectory(PP_TRUE == make_ancestors),
+      PpapiHostMsg_FileRef_MakeDirectory(make_directory_flags),
       base::Bind(&FileRefResource::RunTrackedCallback, this, callback));
   return PP_OK_COMPLETIONPENDING;
 }
 
 int32_t FileRefResource::Touch(PP_Time last_access_time,
                                PP_Time last_modified_time,
                                scoped_refptr<TrackedCallback> callback) {
   Call<PpapiPluginMsg_FileRef_TouchReply>(
       BROWSER,
       PpapiHostMsg_FileRef_Touch(last_access_time,
@@ skipping 104 matching lines @@
       entries.push_back(entry);
     }
 
     writer.StoreVector(entries);
   }
   callback->Run(params.result());
 }
 
 }  // namespace proxy
 }  // namespace ppapi