PPAPI: Add new PPB_FileRef.MakeDirectory to support exclusive operation

content/browser/renderer_host/pepper/pepper_file_ref_host.cc

Index: content/browser/renderer_host/pepper/pepper_file_ref_host.cc
diff --git a/content/browser/renderer_host/pepper/pepper_file_ref_host.cc b/content/browser/renderer_host/pepper/pepper_file_ref_host.cc
index 75350a03632f653bbf5b098c1674fb40f38a3dd9..736c93008f684c312618f953b4fdc9565b770da3 100644
--- a/content/browser/renderer_host/pepper/pepper_file_ref_host.cc
+++ b/content/browser/renderer_host/pepper/pepper_file_ref_host.cc
@@ -180,12 +180,13 @@ int32_t PepperFileRefHost::OnResourceMessageReceived(
 
 int32_t PepperFileRefHost::OnMakeDirectory(
     ppapi::host::HostMessageContext* context,
+    bool exclusive,
     bool make_ancestors) {
   int32_t rv = CanCreate();
   if (rv != PP_OK)
     return rv;
   return backend_->MakeDirectory(context->MakeReplyMessageContext(),
-                                 make_ancestors);
+                                 exclusive, make_ancestors);
 }
 
 int32_t PepperFileRefHost::OnTouch(ppapi::host::HostMessageContext* context,