Mojo: Add NotifyBadMessage API

mojo/edk/system/ports_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_EDK_SYSTEM_PORTS_MESSAGE_H__
 #define MOJO_EDK_SYSTEM_PORTS_MESSAGE_H__
 
 #include <memory>
 #include <utility>
 
 #include "mojo/edk/embedder/platform_handle_vector.h"
 #include "mojo/edk/system/channel.h"
 #include "mojo/edk/system/ports/message.h"
+#include "mojo/edk/system/ports/name.h"
 
 namespace mojo {
 namespace edk {
 
 class NodeController;
 
 class PortsMessage : public ports::Message {
  public:
   static std::unique_ptr<PortsMessage> NewUserMessage(size_t num_payload_bytes,
                                                       size_t num_ports,
                                                       size_t num_handles);
 
   ~PortsMessage() override;
 
   size_t num_handles() const { return channel_message_->num_handles(); }
   bool has_handles() const { return channel_message_->has_handles(); }
 
   void SetHandles(ScopedPlatformHandleVectorPtr handles) {
     channel_message_->SetHandles(std::move(handles));
   }
 
   ScopedPlatformHandleVectorPtr TakeHandles() {
     return channel_message_->TakeHandles();
   }
 
   Channel::MessagePtr TakeChannelMessage() {
     return std::move(channel_message_);
   }
 
+  void set_source_node(const ports::NodeName& name) { source_node_ = name; }
+  const ports::NodeName& source_node() const { return source_node_; }
+
  private:
   friend class NodeController;
 
   // Construct a new user PortsMessage backed by a new Channel::Message.
   PortsMessage(size_t num_payload_bytes, size_t num_ports, size_t num_handles);
 
   // Construct a new PortsMessage backed by a Channel::Message. If
   // |channel_message| is null, a new one is allocated internally.
   PortsMessage(size_t num_header_bytes,
                size_t num_payload_bytes,
                size_t num_ports_bytes,
                Channel::MessagePtr channel_message);
 
   Channel::MessagePtr channel_message_;
+
+  // The node name from which this message was received, if known.
+  ports::NodeName source_node_ = ports::kInvalidNodeName;
 };
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_PORTS_MESSAGE_H__