Implement video frame acknowledgements in the chromoting protocol.

remoting/protocol/message_decoder.h

Index: remoting/protocol/message_decoder.h
diff --git a/remoting/protocol/message_decoder.h b/remoting/protocol/message_decoder.h
index fc42871ddee5dacc6bc5477509f35b002fc324d5..049d1f4caa8fcfed27db854f5dabea05fdf1869b 100644
--- a/remoting/protocol/message_decoder.h
+++ b/remoting/protocol/message_decoder.h
@@ -35,6 +35,8 @@ class MessageDecoder {
   MessageDecoder();
   virtual ~MessageDecoder();
 
+  bool is_buffer_empty() { return buffer_.total_bytes() == 0; }

[Wez, 2015/01/21 01:35:40]

Needs a comment to clarify the difference between this and GetNextMessage()
returning nullptr.

[Sergey Ulanov, 2015/01/29 01:33:29]

Done.

+
   // Add next chunk of data. MessageDecoder retains |data| until all
   // its bytes are consumed.
   void AddData(scoped_refptr<net::IOBuffer> data, int data_size);