Mojo: Add NotifyBadMessage API

mojo/public/c/system/thunks.cc

Index: mojo/public/c/system/thunks.cc
diff --git a/mojo/public/c/system/thunks.cc b/mojo/public/c/system/thunks.cc
index fe2793b7c5a1a75ac58298563e606233e4e2377d..1960dd6065f4fdd7d67e6557112ea9130aede75c 100644
--- a/mojo/public/c/system/thunks.cc
+++ b/mojo/public/c/system/thunks.cc
@@ -275,6 +275,13 @@ MojoResult MojoUnwrapPlatformSharedBufferHandle(
                                                    num_bytes, flags);
 }
 
+MojoResult MojoNotifyBadMessage(MojoMessageHandle message,
+                                const char* error,
+                                size_t error_num_bytes) {
+  assert(g_thunks.NotifyBadMessage);
+  return g_thunks.NotifyBadMessage(message, error, error_num_bytes);
+}
+
 }  // extern "C"
 
 size_t MojoEmbedderSetSystemThunks(const MojoSystemThunks* system_thunks) {