RTCMediaStreamTrackStats.framesDropped collected by RTCStatsCollector.

webrtc/pc/rtcstats_integrationtest.cc

 /*
  *  Copyright 2016 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.
  */
 
@@ skipping 426 matching lines @@
           media_stream_track.frame_width);
       verifier.TestMemberIsNonNegative<uint32_t>(
           media_stream_track.frame_height);
       verifier.TestMemberIsUndefined(media_stream_track.frames_per_second);
       if (*media_stream_track.remote_source) {
         verifier.TestMemberIsUndefined(media_stream_track.frames_sent);
         verifier.TestMemberIsNonNegative<uint32_t>(
             media_stream_track.frames_received);
         verifier.TestMemberIsNonNegative<uint32_t>(
             media_stream_track.frames_decoded);
+        verifier.TestMemberIsNonNegative<uint32_t>(
+            media_stream_track.frames_dropped);
       } else {
         verifier.TestMemberIsNonNegative<uint32_t>(
             media_stream_track.frames_sent);
         verifier.TestMemberIsUndefined(media_stream_track.frames_received);
         verifier.TestMemberIsUndefined(media_stream_track.frames_decoded);
+        verifier.TestMemberIsUndefined(media_stream_track.frames_dropped);
       }
-      verifier.TestMemberIsUndefined(media_stream_track.frames_dropped);
       verifier.TestMemberIsUndefined(media_stream_track.frames_corrupted);
       verifier.TestMemberIsUndefined(media_stream_track.partial_frames_lost);
       verifier.TestMemberIsUndefined(media_stream_track.full_frames_lost);
       // Audio-only members should be undefined
       verifier.TestMemberIsUndefined(media_stream_track.audio_level);
       verifier.TestMemberIsUndefined(media_stream_track.echo_return_loss);
       verifier.TestMemberIsUndefined(
           media_stream_track.echo_return_loss_enhancement);
     } else {
       RTC_DCHECK_EQ(*media_stream_track.kind,
@@ skipping 159 matching lines @@
   caller_ = nullptr;
   // Any pending stats requests should have completed in the act of destroying
   // the peer connection.
   EXPECT_TRUE(stats_obtainer->report());
 }
 #endif  // HAVE_SCTP
 
 }  // namespace
 
 }  // namespace webrtc