Mojo: Report bindings validation errors via MojoNotifyBadMessage

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

 // 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.
 
 #include "mojo/public/cpp/bindings/lib/message_buffer.h"
 
 #include <limits>
 
 #include "mojo/public/cpp/bindings/lib/serialization_util.h"
 
@@ skipping 43 matching lines @@
   if (new_bytes_claimed > data_num_bytes_) {
     NOTREACHED();
     return nullptr;
   }
 
   char* start = static_cast<char*>(buffer_) + bytes_claimed_;
   bytes_claimed_ = new_bytes_claimed;
   return static_cast<void*>(start);
 }
 
+void MessageBuffer::NotifyBadMessage(const std::string& error) {
+  DCHECK(message_.is_valid());
+  MojoResult result = mojo::NotifyBadMessage(message_.get(), error);
+  DCHECK_EQ(result, MOJO_RESULT_OK);
+}
+
 }  // namespace internal
 }  // namespace mojo