Added kNotAProbe definiton to PacketInfo.

webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h

Index: webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
diff --git a/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h b/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
index 364d9718372f5aeb4641abc268f54e40a36f65da..73571b8dc244557ed8a6676f9a3f7bb1973bf794 100644
--- a/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
+++ b/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
@@ -278,6 +278,8 @@ struct PacketInfo {
         payload_size(payload_size),
         probe_cluster_id(probe_cluster_id) {}
 
+  static constexpr int kNotAProbe = -1;

[nisse-webrtc, 2017/02/17 14:49:04]

It would have been appropriate with a TODO saying how and when to delete this.
But I hope you can get rid of it reasonably soon?

+
   // Time corresponding to when this object was created.
   int64_t creation_time_ms;
   // Time corresponding to when the packet was received. Timestamped with the