Mojo: Report bindings validation errors via MojoNotifyBadMessage

mojo/public/cpp/bindings/message.h

 // Copyright 2014 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_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <limits>
 #include <memory>
+#include <string>
 #include <vector>
 
 #include "base/logging.h"
 #include "mojo/public/cpp/bindings/lib/message_buffer.h"
 #include "mojo/public/cpp/bindings/lib/message_internal.h"
 #include "mojo/public/cpp/system/message.h"
 
 namespace mojo {
 
 // Message is a holder for the data and handles to be sent over a MessagePipe.
@@ skipping 69 matching lines @@
   std::vector<Handle>* mutable_handles() { return &handles_; }
 
   // Access the underlying Buffer interface.
   internal::Buffer* buffer() { return buffer_.get(); }
 
   // Takes a scoped MessageHandle which may be passed to |WriteMessageNew()| for
   // transmission. Note that this invalidates this Message object, taking
   // 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();
 
   std::unique_ptr<internal::MessageBuffer> buffer_;
   std::vector<Handle> handles_;
 
   DISALLOW_COPY_AND_ASSIGN(Message);
 };
 
 class MessageReceiver {
@@ skipping 70 matching lines @@
 // the caller should wait on the handle to become readable. Returns
 // MOJO_RESULT_OK if the message was read successfully and should be
 // dispatched, otherwise returns an error code if something went wrong.
 //
 // NOTE: The message hasn't been validated and may be malformed!
 MojoResult ReadMessage(MessagePipeHandle handle, Message* message);
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_H_