[mojo-edk] Expose notification source to MojoWatch callbacks

ipc/mojo/ipc_mojo_bootstrap.cc

Index: ipc/mojo/ipc_mojo_bootstrap.cc
diff --git a/ipc/mojo/ipc_mojo_bootstrap.cc b/ipc/mojo/ipc_mojo_bootstrap.cc
index a80b46103014ca07e305618d986a9b3f52239bc2..db498b40107c4756639eed962c88957cb06b8963 100644
--- a/ipc/mojo/ipc_mojo_bootstrap.cc
+++ b/ipc/mojo/ipc_mojo_bootstrap.cc
@@ -48,6 +48,7 @@ void MojoServerBootstrap::Connect() {
   bootstrap_.Bind(mojom::BootstrapPtrInfo(TakeHandle(), 0));
   bootstrap_.set_connection_error_handler(
       base::Bind(&MojoServerBootstrap::Fail, base::Unretained(this)));
+  bootstrap_.SetAllowSyncDispatch(true);
 
   IPC::mojom::ChannelAssociatedRequest send_channel_request;
   IPC::mojom::ChannelAssociatedPtrInfo receive_channel;
@@ -107,6 +108,7 @@ void MojoClientBootstrap::Connect() {
   binding_.Bind(TakeHandle());
   binding_.set_connection_error_handler(
       base::Bind(&MojoClientBootstrap::Fail, base::Unretained(this)));
+  binding_.SetAllowSyncDispatch(true);
 }
 
 void MojoClientBootstrap::Init(mojom::ChannelAssociatedRequest receive_channel,