Require negotiation to send transport cc feedback over RTCP.

webrtc/video/video_quality_test.cc

Index: webrtc/video/video_quality_test.cc
diff --git a/webrtc/video/video_quality_test.cc b/webrtc/video/video_quality_test.cc
index ebceb5642b7e33520ebe1c78b2afc98f2e4ed1b5..951afaf3514a7f58371af8483d57f7ae1d1f3c7a 100644
--- a/webrtc/video/video_quality_test.cc
+++ b/webrtc/video/video_quality_test.cc
@@ -828,6 +828,8 @@ void VideoQualityTest::SetupCommon(Transport* send_transport,
     receive_configs_[i].rtp.rtx[kSendRtxPayloadType].ssrc = kSendRtxSsrcs[i];
     receive_configs_[i].rtp.rtx[kSendRtxPayloadType].payload_type =
         kSendRtxPayloadType;
+    receive_configs_[i].rtp.transport_cc_feedback =
+        params_.common.send_side_bwe;
   }
 }