Add implemented-but-missing members to RTCMediaStreamTrackStats::Members

silentConcealedSamples, insertedSamplesForDeceleration and
removedSamplesForAcceleration were implemented in M76, but we forgot to
add them to the WEBRTC_RTCSTATS_IMPL list, meaning the "iterate all
members" method, RTCStats::Members(), did not contain these metrics.
As a consequence, Chrome did not pick up these members for exposure to
JavaScript.

Also fix the test coverage in rtc_stats_integrationtest.cc where code
paths that did not apply to audio track stats were not explicitly
asserting that they must be undefined in those cases.

(cherry picked from commit 21e99da)

Bug: chromium:996146, webrtc:10903
Change-Id: I00e7ddee600818ee4d561b88e005391830adcf3e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/149816
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Cr-Original-Commit-Position: refs/heads/master@{#28925}
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/150322
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/branch-heads/m77@{#10}
Cr-Branched-From: 2bac7da-refs/heads/master@{#28685}

Author: henbos

pc/rtc_stats_integrationtest.cc

@@ -629,7 +629,13 @@ class RTCStatsReportVerifier {
       verifier.TestMemberIsUndefined(media_stream_track.total_samples_duration);
       verifier.TestMemberIsUndefined(media_stream_track.total_samples_received);
       verifier.TestMemberIsUndefined(media_stream_track.concealed_samples);
+      verifier.TestMemberIsUndefined(
+          media_stream_track.silent_concealed_samples);
       verifier.TestMemberIsUndefined(media_stream_track.concealment_events);
+      verifier.TestMemberIsUndefined(
+          media_stream_track.inserted_samples_for_deceleration);
+      verifier.TestMemberIsUndefined(
+          media_stream_track.removed_samples_for_acceleration);
       verifier.TestMemberIsUndefined(media_stream_track.jitter_buffer_flushes);
       verifier.TestMemberIsUndefined(
           media_stream_track.delayed_packet_outage_samples);
@@ -657,14 +663,14 @@ class RTCStatsReportVerifier {
             media_stream_track.total_samples_duration);
         verifier.TestMemberIsNonNegative<uint64_t>(
             media_stream_track.concealed_samples);
+        verifier.TestMemberIsNonNegative<uint64_t>(
+            media_stream_track.silent_concealed_samples);
         verifier.TestMemberIsNonNegative<uint64_t>(
             media_stream_track.concealment_events);
         verifier.TestMemberIsNonNegative<uint64_t>(
             media_stream_track.inserted_samples_for_deceleration);
         verifier.TestMemberIsNonNegative<uint64_t>(
             media_stream_track.removed_samples_for_acceleration);
-        verifier.TestMemberIsNonNegative<uint64_t>(
-            media_stream_track.silent_concealed_samples);
         verifier.TestMemberIsNonNegative<uint64_t>(
             media_stream_track.jitter_buffer_flushes);
         verifier.TestMemberIsNonNegative<uint64_t>(
@@ -689,7 +695,13 @@ class RTCStatsReportVerifier {
         verifier.TestMemberIsUndefined(
             media_stream_track.total_samples_duration);
         verifier.TestMemberIsUndefined(media_stream_track.concealed_samples);
+        verifier.TestMemberIsUndefined(
+            media_stream_track.silent_concealed_samples);
         verifier.TestMemberIsUndefined(media_stream_track.concealment_events);
+        verifier.TestMemberIsUndefined(
+            media_stream_track.inserted_samples_for_deceleration);
+        verifier.TestMemberIsUndefined(
+            media_stream_track.removed_samples_for_acceleration);
         verifier.TestMemberIsUndefined(
             media_stream_track.jitter_buffer_flushes);
         verifier.TestMemberIsUndefined(

stats/rtcstats_objects.cc

@@ -391,7 +391,10 @@ WEBRTC_RTCSTATS_IMPL(RTCMediaStreamTrackStats, RTCStats, "track",
                      &total_samples_received,
                      &total_samples_duration,
                      &concealed_samples,
+                     &silent_concealed_samples,
                      &concealment_events,
+                     &inserted_samples_for_deceleration,
+                     &removed_samples_for_acceleration,
                      &jitter_buffer_flushes,
                      &delayed_packet_outage_samples,
                      &relative_packet_arrival_delay,