Implement I420FrameCallbacks in Call.

BUG=2425
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2393004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5005 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video_engine/internal/video_send_stream.h b/video_engine/internal/video_send_stream.h
index 1241b48..27027ef 100644
--- a/video_engine/internal/video_send_stream.h
+++ b/video_engine/internal/video_send_stream.h
@@ -26,6 +26,7 @@
 class ViECodec;
 class ViEExternalCapture;
 class ViEExternalCodec;
+class ViEImageProcess;
 class ViENetwork;
 class ViERTP_RTCP;
 
@@ -72,6 +73,7 @@
   ViEExternalCodec* external_codec_;
   ViENetwork* network_;
   ViERTP_RTCP* rtp_rtcp_;
+  ViEImageProcess* image_process_;
 
   int channel_;
   int capture_id_;