PPAPI: Add new PPB_FileRef.MakeDirectory to support exclusive operation

ppapi/proxy/file_ref_resource.cc

Index: ppapi/proxy/file_ref_resource.cc
diff --git a/ppapi/proxy/file_ref_resource.cc b/ppapi/proxy/file_ref_resource.cc
index 7cd96bc60a0685251c888b41c0fe8cae3e05bb38..1e979f3471fa6f7fd471193b0bb4dcf324955cac 100644
--- a/ppapi/proxy/file_ref_resource.cc
+++ b/ppapi/proxy/file_ref_resource.cc
@@ -129,11 +129,13 @@ PP_Resource FileRefResource::GetParent() {
 }
 
 int32_t FileRefResource::MakeDirectory(
+    PP_Bool exclusive,
     PP_Bool make_ancestors,
     scoped_refptr<TrackedCallback> callback) {
   Call<PpapiPluginMsg_FileRef_MakeDirectoryReply>(
       BROWSER,
-      PpapiHostMsg_FileRef_MakeDirectory(PP_TRUE == make_ancestors),
+      PpapiHostMsg_FileRef_MakeDirectory(
+          PP_TRUE == exclusive, PP_TRUE == make_ancestors),
       base::Bind(&FileRefResource::RunTrackedCallback, this, callback));
   return PP_OK_COMPLETIONPENDING;
 }