Simplify message parsing.

remoting/protocol/channel_dispatcher_base.cc

 // Copyright (c) 2012 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 "remoting/protocol/channel_dispatcher_base.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "remoting/protocol/p2p_stream_socket.h"
@@ skipping 29 matching lines @@
     return;
   }
 
   channel_factory_ = nullptr;
   channel_ = std::move(socket);
   writer_.Start(
       base::Bind(&P2PStreamSocket::Write, base::Unretained(channel_.get())),
       base::Bind(&ChannelDispatcherBase::OnReadWriteFailed,
                  base::Unretained(this)));
   reader_.StartReading(channel_.get(),
+                       base::Bind(&ChannelDispatcherBase::OnIncomingMessage,
+                                  base::Unretained(this)),
                        base::Bind(&ChannelDispatcherBase::OnReadWriteFailed,
                                   base::Unretained(this)));
 
   event_handler_->OnChannelInitialized(this);
 }
 
+void ChannelDispatcherBase::OnIncomingMessage(
+    scoped_ptr<CompoundBuffer> message) {
+  // By default incoming message are not expected. Child classes override
+  // OnIncomingMessage() if the want to handle incoming messages.
+  LOG(ERROR) << "Received unexpected message on " << channel_name();
+}
+
 void ChannelDispatcherBase::OnReadWriteFailed(int error) {
   event_handler_->OnChannelError(this, CHANNEL_CONNECTION_ERROR);
 }
 
 }  // namespace protocol
 }  // namespace remoting