Mojo: Report bindings validation errors via MojoNotifyBadMessage

mojo/public/cpp/bindings/message.h

Index: mojo/public/cpp/bindings/message.h
diff --git a/mojo/public/cpp/bindings/message.h b/mojo/public/cpp/bindings/message.h
index d8eed2bfc3ec00a96948954a86ade3b99fdc088c..87a6f58a43314b07c0fbaebbbb2be6a5276f3b5e 100644
--- a/mojo/public/cpp/bindings/message.h
+++ b/mojo/public/cpp/bindings/message.h
@@ -10,6 +10,7 @@
 
 #include <limits>
 #include <memory>
+#include <string>
 #include <vector>
 
 #include "base/logging.h"
@@ -99,6 +100,10 @@ class Message {
   // ownership of its internal storage and any attached handles.
   ScopedMessageHandle TakeMojoMessage();
 
+  // Notifies the system that this message is "bad," in this case meaning it was
+  // rejected by bindings validation code.
+  void NotifyBadMessage(const std::string& error);
+
  private:
   void CloseHandles();