Mojo: Report bindings validation errors via MojoNotifyBadMessage

mojo/public/cpp/bindings/lib/message_buffer.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_BINDINGS_MESSAGE_LIB_MESSAGE_BUFFER_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_LIB_MESSAGE_BUFFER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 18 matching lines @@
   ~MessageBuffer() override;
 
   void* data() const { return buffer_; }
   uint32_t data_num_bytes() const { return data_num_bytes_; }
 
   // Buffer:
   void* Allocate(size_t delta) override;
 
   ScopedMessageHandle TakeMessage() { return std::move(message_); }
 
+  void NotifyBadMessage(const std::string& error);
+
  private:
   uint32_t data_num_bytes_ = 0;
   ScopedMessageHandle message_;
   void* buffer_;
 
   uint32_t bytes_claimed_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(MessageBuffer);
 };
 
 }  // namespace internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_LIB_MESSAGE_BUFFER_H_