[mojo-edk] Expose notification source to MojoWatch callbacks

mojo/public/cpp/bindings/lib/multiplex_router.cc

Index: mojo/public/cpp/bindings/lib/multiplex_router.cc
diff --git a/mojo/public/cpp/bindings/lib/multiplex_router.cc b/mojo/public/cpp/bindings/lib/multiplex_router.cc
index 48d8393683e1a3ba1d87f1a8c161e27483796842..9b46e96c6d2b6fd8f675bb64382822f2833e8b67 100644
--- a/mojo/public/cpp/bindings/lib/multiplex_router.cc
+++ b/mojo/public/cpp/bindings/lib/multiplex_router.cc
@@ -320,6 +320,10 @@ void MultiplexRouter::EnableTestingMode() {
   connector_.set_enforce_errors_from_incoming_receiver(false);
 }
 
+void MultiplexRouter::SetAllowSyncDispatch(bool allowed) {
+  connector_.SetAllowSyncDispatch(allowed);
+}
+
 bool MultiplexRouter::Accept(Message* message) {
   DCHECK(thread_checker_.CalledOnValidThread());