Add VideoPacket struct for video packets. Refactor Decode interface to use it.

remoting/protocol/video_writer.h

Index: remoting/protocol/video_writer.h
diff --git a/remoting/protocol/video_writer.h b/remoting/protocol/video_writer.h
index 0b39bcb0129641f6ca12ac9b6729da46cb3f1fbc..d1f8403612179abe23c91b6ac138b9d1abd4c11d 100644
--- a/remoting/protocol/video_writer.h
+++ b/remoting/protocol/video_writer.h
@@ -11,19 +11,16 @@
 #define REMOTING_PROTOCOL_VIDEO_WRITER_H_
 
 #include "base/basictypes.h"
-#include "remoting/proto/video.pb.h"
 
 namespace remoting {
 
-namespace protocol {
-class Session;
-}  // namespace protocol
-
 class ChromotocolConfig;
-class ChromotocolConnection;
+class VideoPacket;
 
 namespace protocol {
 
+class Session;
+
 // TODO(sergeyu): VideoWriter should implement VideoStub interface.
 class VideoWriter {
  public: