Add experiment to disable ulpfec.

webrtc/video/video_send_stream_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>  // max
@@ skipping 536 matching lines @@
   UlpfecObserver test(true, false, true, true, "VP8", encoder.get());
   RunBaseTest(&test);
 }
 
 TEST_F(VideoSendStreamTest, SupportsUlpfecWithoutExtensions) {
   std::unique_ptr<VideoEncoder> encoder(VP8Encoder::Create());
   UlpfecObserver test(false, false, true, true, "VP8", encoder.get());
   RunBaseTest(&test);
 }
 
+class VideoSendStreamWithoutUlpfecTest : public VideoSendStreamTest {
+ protected:
+  VideoSendStreamWithoutUlpfecTest()
+      : field_trial_("WebRTC-DisableUlpFecExperiment/Enabled/") {}
+
+  test::ScopedFieldTrials field_trial_;
+};
+
+TEST_F(VideoSendStreamWithoutUlpfecTest, NoUlpfecIfDisabledThroughFieldTrial) {
+  std::unique_ptr<VideoEncoder> encoder(VP8Encoder::Create());
+  UlpfecObserver test(false, false, true, false, "VP8", encoder.get());
+  RunBaseTest(&test);
+}
+
 // The FEC scheme used is not efficient for H264, so we should not use RED/FEC
 // since we'll still have to re-request FEC packets, effectively wasting
 // bandwidth since the receiver has to wait for FEC retransmissions to determine
 // that the received state is actually decodable.
 TEST_F(VideoSendStreamTest, DoesNotUtilizeUlpfecForH264WithNackEnabled) {
   std::unique_ptr<VideoEncoder> encoder(
       new test::FakeH264Encoder(Clock::GetRealTimeClock()));
   UlpfecObserver test(false, true, true, false, "H264", encoder.get());
   RunBaseTest(&test);
 }
@@ skipping 2923 matching lines @@
       capturer_ = frame_generator_capturer;
     }
 
     test::FrameGeneratorCapturer* capturer_ = nullptr;
   } test;
 
   RunBaseTest(&test);
 }
 
 }  // namespace webrtc