Add client and host dispatchers for video_stats channel to send video stats from host to client.

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/base/compound_buffer.h"
 #include "remoting/protocol/message_channel_factory.h"
 #include "remoting/protocol/message_pipe.h"
 
 namespace remoting {
 namespace protocol {
 
-ChannelDispatcherBase::ChannelDispatcherBase(const char* channel_name)
+ChannelDispatcherBase::ChannelDispatcherBase(const std::string& channel_name)
     : channel_name_(channel_name) {}
 
 ChannelDispatcherBase::~ChannelDispatcherBase() {
   if (channel_factory_)
     channel_factory_->CancelChannelCreation(channel_name_);
 }
 
 void ChannelDispatcherBase::Init(MessageChannelFactory* channel_factory,
                                  EventHandler* event_handler) {
   channel_factory_ = channel_factory;
@@ skipping 22 matching lines @@
   event_handler_->OnChannelInitialized(this);
 }
 
 void ChannelDispatcherBase::OnMessageReceived(
     std::unique_ptr<CompoundBuffer> message) {
   OnIncomingMessage(std::move(message));
 }
 
 void ChannelDispatcherBase::OnMessagePipeClosed() {
   is_connected_ = false;
+  message_pipe_.reset();
   event_handler_->OnChannelClosed(this);
 }
 
 }  // namespace protocol
 }  // namespace remoting