Mojo: Add NotifyBadMessage API

mojo/public/cpp/system/message.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_PUBLIC_CPP_SYSTEM_MESSAGE_H_
 #define MOJO_PUBLIC_CPP_SYSTEM_MESSAGE_H_
 
 #include <limits>
 
 #include "base/macros.h"
+#include "base/strings/string_piece.h"
 #include "mojo/public/c/system/message_pipe.h"
 #include "mojo/public/cpp/system/handle.h"
 
 namespace mojo {
 
 const MojoMessageHandle kInvalidMessageHandleValue =
     MOJO_MESSAGE_HANDLE_INVALID;
 
 // Handle wrapper base class for a |MojoMessageHandle|.
 class MessageHandle {
@@ skipping 43 matching lines @@
 
   handle->reset(MessageHandle(raw_handle));
   return MOJO_RESULT_OK;
 }
 
 inline MojoResult GetMessageBuffer(MessageHandle message, void** buffer) {
   DCHECK(message.is_valid());
   return MojoGetMessageBuffer(message.value(), buffer);
 }
 
+inline MojoResult NotifyBadMessage(MessageHandle message,
+                                   const base::StringPiece& error) {
+  DCHECK(message.is_valid());
+  return MojoNotifyBadMessage(message.value(), error.data(), error.size());
+}
+
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_SYSTEM_MESSAGE_H_