Implement video frame acknowledgements in the chromoting protocol.

remoting/protocol/channel_dispatcher_base.h

Index: remoting/protocol/channel_dispatcher_base.h
diff --git a/remoting/protocol/channel_dispatcher_base.h b/remoting/protocol/channel_dispatcher_base.h
index 0c80b30c5a3758a82853be5338d64d323de05c4d..539213d8edffa9b2227362503cddfcf3c287797c 100644
--- a/remoting/protocol/channel_dispatcher_base.h
+++ b/remoting/protocol/channel_dispatcher_base.h
@@ -13,6 +13,7 @@
 #include "remoting/protocol/buffered_socket_writer.h"
 #include "remoting/protocol/errors.h"
 #include "remoting/protocol/message_reader.h"
+#include "remoting/protocol/session_config.h"
 
 namespace net {
 class StreamSocket;
@@ -21,7 +22,6 @@ class StreamSocket;
 namespace remoting {
 namespace protocol {
 
-struct ChannelConfig;
 class StreamChannelFactory;
 class Session;
 
@@ -62,8 +62,12 @@ class ChannelDispatcherBase {
  protected:
   explicit ChannelDispatcherBase(const char* channel_name);
 
+  // Calls event_handler_->OnChannelError() with the supplied |error|.
+  void NotifyError(ErrorCode error);
+
   BufferedSocketWriter* writer() { return &writer_; }
   MessageReader* reader() { return &reader_; }
+  const ChannelConfig& channel_config() { return channel_config_; }
 
  private:
   void OnChannelReady(scoped_ptr<net::StreamSocket> socket);
@@ -71,6 +75,7 @@ class ChannelDispatcherBase {
 
   std::string channel_name_;
   StreamChannelFactory* channel_factory_;
+  ChannelConfig channel_config_;
   EventHandler* event_handler_;
   scoped_ptr<net::StreamSocket> channel_;