Mojo: Report bindings validation errors via MojoNotifyBadMessage

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

Index: mojo/public/cpp/bindings/lib/pipe_control_message_proxy.cc
diff --git a/mojo/public/cpp/bindings/lib/pipe_control_message_proxy.cc b/mojo/public/cpp/bindings/lib/pipe_control_message_proxy.cc
index a7f340fb701d4deeba0dcd4344be7899409012cf..a7cea2085d557b37bd7b93affeef3848162dec44 100644
--- a/mojo/public/cpp/bindings/lib/pipe_control_message_proxy.cc
+++ b/mojo/public/cpp/bindings/lib/pipe_control_message_proxy.cc
@@ -35,7 +35,8 @@ void SendRunOrClosePipeMessage(MessageReceiver* receiver,
       params_ptr, builder.buffer(), &params, context);
   params->EncodePointers();
   builder.message()->set_interface_id(kInvalidInterfaceId);
-  bool ok = receiver->Accept(builder.message());
+  Error send_error;
+  bool ok = receiver->Accept(builder.message(), &send_error);
   // This return value may be ignored as !ok implies the underlying message pipe
   // has encountered an error, which will be visible through other means.
   ALLOW_UNUSED_LOCAL(ok);