Wire up currently-received video codec to stats.

webrtc/video/end_to_end_tests.cc

Index: webrtc/video/end_to_end_tests.cc
diff --git a/webrtc/video/end_to_end_tests.cc b/webrtc/video/end_to_end_tests.cc
index 7e04f5f8baed67cebfa887ce6b1df36d39eeb044..f39d977a3af34d2380f1e0f87c36e6805450ddb4 100644
--- a/webrtc/video/end_to_end_tests.cc
+++ b/webrtc/video/end_to_end_tests.cc
@@ -2227,6 +2227,11 @@ TEST_F(EndToEndTest, GetStats) {
             stats.rtcp_packet_type_counts.pli_packets != 0 ||
             stats.rtcp_packet_type_counts.nack_requests != 0 ||
             stats.rtcp_packet_type_counts.unique_nack_requests != 0;
+
+        assert(stats.current_payload_type == -1 ||
+               stats.current_payload_type == kFakeSendPayloadType);
+        receive_stats_filled_["IncomingPayloadType"] |=
+            stats.current_payload_type == kFakeSendPayloadType;
       }
 
       return AllStatsFilled(receive_stats_filled_);