Nack count returned on OnReceivedPacket.

webrtc/modules/video_coding/nack_module.h

Index: webrtc/modules/video_coding/nack_module.h
diff --git a/webrtc/modules/video_coding/nack_module.h b/webrtc/modules/video_coding/nack_module.h
index 7163a8e9054151ea790e266cc3ffa47890464958..941b911475e24a800f1a2117692abb611bddb75b 100644
--- a/webrtc/modules/video_coding/nack_module.h
+++ b/webrtc/modules/video_coding/nack_module.h
@@ -32,7 +32,7 @@ class NackModule : public Module {
              NackSender* nack_sender,
              KeyFrameRequestSender* keyframe_request_sender);
 
-  void OnReceivedPacket(const VCMPacket& packet);
+  int OnReceivedPacket(const VCMPacket& packet);
   void ClearUpTo(uint16_t seq_num);
   void UpdateRtt(int64_t rtt_ms);
   void Clear();
@@ -59,11 +59,6 @@ class NackModule : public Module {
     int64_t sent_at_time;
     int retries;
   };
-
-  struct SeqNumComparator {
-    bool operator()(uint16_t s1, uint16_t s2) const { return AheadOf(s2, s1); }
-  };
-
   void AddPacketsToNack(uint16_t seq_num_start, uint16_t seq_num_end)
       EXCLUSIVE_LOCKS_REQUIRED(crit_);
 
@@ -87,8 +82,10 @@ class NackModule : public Module {
   NackSender* const nack_sender_;
   KeyFrameRequestSender* const keyframe_request_sender_;
 
-  std::map<uint16_t, NackInfo, SeqNumComparator> nack_list_ GUARDED_BY(crit_);
-  std::set<uint16_t, SeqNumComparator> keyframe_list_ GUARDED_BY(crit_);
+  std::map<uint16_t, NackInfo, DescendingSeqNumComp<uint16_t>> nack_list_
+      GUARDED_BY(crit_);
+  std::set<uint16_t, DescendingSeqNumComp<uint16_t>> keyframe_list_
+      GUARDED_BY(crit_);
   video_coding::Histogram reordering_histogram_ GUARDED_BY(crit_);
   bool running_ GUARDED_BY(crit_);
   bool initialized_ GUARDED_BY(crit_);