Require negotiation to send transport cc feedback over RTCP.

webrtc/video/end_to_end_tests.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #include <algorithm>
@@ skipping 1567 matching lines @@
         test::FrameGeneratorCapturer** frame_generator) override {
       send_config->rtp.extensions.push_back(
           RtpExtension(RtpExtension::kTransportSequenceNumber, kExtensionId));
     }
 
     void UpdateReceiveConfig(
         size_t stream_index,
         VideoReceiveStream::Config* receive_config) override {
       receive_config->rtp.extensions.push_back(
           RtpExtension(RtpExtension::kTransportSequenceNumber, kExtensionId));
+      receive_config->rtp.transport_cc_feedback = true;
     }
 
     test::DirectTransport* CreateReceiveTransport(
         Call* receiver_call) override {
       return new TransportFeedbackObserver(receiver_call, &done_);
     }
 
    private:
     rtc::Event done_;
   } tester;
@@ skipping 1582 matching lines @@
   EXPECT_TRUE(default_receive_config.rtp.rtx.empty())
       << "Enabling RTX requires rtpmap: rtx negotiation.";
   EXPECT_TRUE(default_receive_config.rtp.extensions.empty())
       << "Enabling RTP extensions require negotiation.";
 
   VerifyEmptyNackConfig(default_receive_config.rtp.nack);
   VerifyEmptyFecConfig(default_receive_config.rtp.fec);
 }
 
 }  // namespace webrtc