Revert of RTCInboundRTPStreamStats.qpSum collected. (patchset #4 id:80001 of https://codereview.webrtc.org/2675943002/ )

Reason for revert:
Breaks downstream build.

Original issue's description:
> RTCInboundRTPStreamStats.qpSum collected.
>
> This was previously only collected for local tracks
> (RTCOutboundRTPStreamStats.qpSum).
>
> Spec: https://w3c.github.io/webrtc-stats/#dom-rtcrtpstreamstats-qpsum
>
> This CL also improves some testing in rtcstatscollector_unittest.cc.
> Default and non-default values are tested in the same unittests,
> removing the test that was specific to default-values, which was
> otherwise code duplication.
>
> BUG=webrtc:7065
>
> Review-Url: https://codereview.webrtc.org/2675943002
> Cr-Commit-Position: refs/heads/master@{#16477}
> Committed: https://chromium.googlesource.com/external/webrtc/+/cd195bea5e38a61e73b08f82445560d9136cd9da

TBR=sakal@webrtc.org,hta@webrtc.org,hbos@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7065

Review-Url: https://codereview.webrtc.org/2687483002 .
Cr-Original-Commit-Position: refs/heads/master@{#16479}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: ed02c6d68f31baed3cfb7656062895a4d1cb7e65
diff --git a/pc/rtcstatscollector_unittest.cc b/pc/rtcstatscollector_unittest.cc
index 624d23e..715da56 100644
--- a/pc/rtcstatscollector_unittest.cc
+++ b/pc/rtcstatscollector_unittest.cc
@@ -1792,9 +1792,10 @@
   expected_audio.fraction_lost = 5.5;
 
   ASSERT_TRUE(report->Get(expected_audio.id()));
-  EXPECT_EQ(
-      report->Get(expected_audio.id())->cast_to<RTCInboundRTPStreamStats>(),
-      expected_audio);
+  const RTCInboundRTPStreamStats& audio = report->Get(
+      expected_audio.id())->cast_to<RTCInboundRTPStreamStats>();
+  EXPECT_EQ(audio, expected_audio);
+
   EXPECT_TRUE(report->Get(*expected_audio.track_id));
   EXPECT_TRUE(report->Get(*expected_audio.transport_id));
   EXPECT_TRUE(report->Get(*expected_audio.codec_id));
@@ -1825,7 +1826,6 @@
   video_media_info.receivers[0].plis_sent = 6;
   video_media_info.receivers[0].nacks_sent = 7;
   video_media_info.receivers[0].frames_decoded = 8;
-  video_media_info.receivers[0].qp_sum = rtc::Optional<uint64_t>();
 
   RtpCodecParameters codec_parameters;
   codec_parameters.payload_type = 42;
@@ -1876,29 +1876,15 @@
   expected_video.packets_lost = 42;
   expected_video.fraction_lost = 4.5;
   expected_video.frames_decoded = 8;
-  // |expected_video.qp_sum| should be undefined.
 
   ASSERT_TRUE(report->Get(expected_video.id()));
-  EXPECT_EQ(
-      report->Get(expected_video.id())->cast_to<RTCInboundRTPStreamStats>(),
-      expected_video);
+  const RTCInboundRTPStreamStats& video = report->Get(
+      expected_video.id())->cast_to<RTCInboundRTPStreamStats>();
+  EXPECT_EQ(video, expected_video);
 
-  // Set previously undefined values and "GetStats" again.
-  video_media_info.receivers[0].qp_sum = rtc::Optional<uint64_t>(9);
-  expected_video.qp_sum = 9;
-
-  EXPECT_CALL(*video_media_channel, GetStats(_))
-      .WillOnce(DoAll(SetArgPointee<0>(video_media_info), Return(true)));
-  collector_->ClearCachedStatsReport();
-  report = GetStatsReport();
-
-  ASSERT_TRUE(report->Get(expected_video.id()));
-  EXPECT_EQ(
-      report->Get(expected_video.id())->cast_to<RTCInboundRTPStreamStats>(),
-      expected_video);
   EXPECT_TRUE(report->Get(*expected_video.track_id));
   EXPECT_TRUE(report->Get(*expected_video.transport_id));
-  EXPECT_TRUE(report->Get(*expected_video.codec_id));
+  EXPECT_TRUE(report->Get(*video.codec_id));
 }
 
 TEST_F(RTCStatsCollectorTest, CollectRTCOutboundRTPStreamStats_Audio) {
@@ -1918,7 +1904,7 @@
   voice_media_info.senders[0].local_stats[0].ssrc = 1;
   voice_media_info.senders[0].packets_sent = 2;
   voice_media_info.senders[0].bytes_sent = 3;
-  voice_media_info.senders[0].rtt_ms = -1;
+  voice_media_info.senders[0].rtt_ms = 4500;
   voice_media_info.senders[0].codec_payload_type = rtc::Optional<int>(42);
 
   RtpCodecParameters codec_parameters;
@@ -1964,26 +1950,13 @@
   expected_audio.codec_id = "RTCCodec_OutboundAudio_42";
   expected_audio.packets_sent = 2;
   expected_audio.bytes_sent = 3;
-  // |expected_audio.round_trip_time| should be undefined.
-
-  ASSERT_TRUE(report->Get(expected_audio.id()));
-  EXPECT_EQ(
-      report->Get(expected_audio.id())->cast_to<RTCOutboundRTPStreamStats>(),
-      expected_audio);
-
-  // Set previously undefined values and "GetStats" again.
-  voice_media_info.senders[0].rtt_ms = 4500;
   expected_audio.round_trip_time = 4.5;
 
-  EXPECT_CALL(*voice_media_channel, GetStats(_))
-      .WillOnce(DoAll(SetArgPointee<0>(voice_media_info), Return(true)));
-  collector_->ClearCachedStatsReport();
-  report = GetStatsReport();
-
   ASSERT_TRUE(report->Get(expected_audio.id()));
-  EXPECT_EQ(
-      report->Get(expected_audio.id())->cast_to<RTCOutboundRTPStreamStats>(),
-      expected_audio);
+  const RTCOutboundRTPStreamStats& audio = report->Get(
+      expected_audio.id())->cast_to<RTCOutboundRTPStreamStats>();
+  EXPECT_EQ(audio, expected_audio);
+
   EXPECT_TRUE(report->Get(*expected_audio.track_id));
   EXPECT_TRUE(report->Get(*expected_audio.transport_id));
   EXPECT_TRUE(report->Get(*expected_audio.codec_id));
@@ -2009,10 +1982,10 @@
   video_media_info.senders[0].nacks_rcvd = 4;
   video_media_info.senders[0].packets_sent = 5;
   video_media_info.senders[0].bytes_sent = 6;
-  video_media_info.senders[0].rtt_ms = -1;
+  video_media_info.senders[0].rtt_ms = 7500;
   video_media_info.senders[0].codec_payload_type = rtc::Optional<int>(42);
   video_media_info.senders[0].frames_encoded = 8;
-  video_media_info.senders[0].qp_sum = rtc::Optional<uint64_t>();
+  video_media_info.senders[0].qp_sum = rtc::Optional<uint64_t>(16);
 
   RtpCodecParameters codec_parameters;
   codec_parameters.payload_type = 42;
@@ -2060,35 +2033,122 @@
   expected_video.nack_count = 4;
   expected_video.packets_sent = 5;
   expected_video.bytes_sent = 6;
-  expected_video.frames_encoded = 8;
-  // |expected_video.round_trip_time| and |expected_video.qp_sum| should be
-  // undefined.
-
-  ASSERT_TRUE(report->Get(expected_video.id()));
-  EXPECT_EQ(
-      report->Get(expected_video.id())->cast_to<RTCOutboundRTPStreamStats>(),
-      expected_video);
-
-  // Set previously undefined values and "GetStats" again.
-  video_media_info.senders[0].rtt_ms = 7500;
-  video_media_info.senders[0].qp_sum = rtc::Optional<uint64_t>(9);
   expected_video.round_trip_time = 7.5;
-  expected_video.qp_sum = 9;
-
-  EXPECT_CALL(*video_media_channel, GetStats(_))
-      .WillOnce(DoAll(SetArgPointee<0>(video_media_info), Return(true)));
-  collector_->ClearCachedStatsReport();
-  report = GetStatsReport();
+  expected_video.frames_encoded = 8;
+  expected_video.qp_sum = 16;
 
   ASSERT_TRUE(report->Get(expected_video.id()));
-  EXPECT_EQ(
-      report->Get(expected_video.id())->cast_to<RTCOutboundRTPStreamStats>(),
-      expected_video);
+  const RTCOutboundRTPStreamStats& video = report->Get(
+      expected_video.id())->cast_to<RTCOutboundRTPStreamStats>();
+  EXPECT_EQ(video, expected_video);
+
   EXPECT_TRUE(report->Get(*expected_video.track_id));
   EXPECT_TRUE(report->Get(*expected_video.transport_id));
   EXPECT_TRUE(report->Get(*expected_video.codec_id));
 }
 
+TEST_F(RTCStatsCollectorTest, CollectRTCOutboundRTPStreamStats_Default) {
+  MockVoiceMediaChannel* voice_media_channel = new MockVoiceMediaChannel();
+  cricket::VoiceChannel voice_channel(
+      test_->worker_thread(), test_->network_thread(),
+      test_->signaling_thread(), test_->media_engine(), voice_media_channel,
+      "VoiceContentName", kDefaultRtcpMuxRequired, kDefaultSrtpRequired);
+  MockVideoMediaChannel* video_media_channel = new MockVideoMediaChannel();
+  cricket::VideoChannel video_channel(
+      test_->worker_thread(), test_->network_thread(),
+      test_->signaling_thread(), video_media_channel, "VideoContentName",
+      kDefaultRtcpMuxRequired, kDefaultSrtpRequired);
+
+  cricket::VoiceMediaInfo voice_media_info;
+  voice_media_info.senders.push_back(cricket::VoiceSenderInfo());
+  voice_media_info.senders[0].local_stats.push_back(cricket::SsrcSenderInfo());
+  voice_media_info.senders[0].local_stats[0].ssrc = 1;
+  voice_media_info.senders[0].packets_sent = 2;
+  voice_media_info.senders[0].bytes_sent = 3;
+  voice_media_info.senders[0].rtt_ms = -1;
+  voice_media_info.senders[0].codec_payload_type = rtc::Optional<int>(42);
+
+  cricket::VideoMediaInfo video_media_info;
+  video_media_info.senders.push_back(cricket::VideoSenderInfo());
+  video_media_info.senders[0].local_stats.push_back(cricket::SsrcSenderInfo());
+  video_media_info.senders[0].local_stats[0].ssrc = 1;
+  video_media_info.senders[0].firs_rcvd = 2;
+  video_media_info.senders[0].plis_rcvd = 3;
+  video_media_info.senders[0].nacks_rcvd = 4;
+  video_media_info.senders[0].packets_sent = 5;
+  video_media_info.senders[0].bytes_sent = 6;
+  video_media_info.senders[0].rtt_ms = -1;
+  video_media_info.senders[0].codec_payload_type = rtc::Optional<int>(42);
+  video_media_info.senders[0].frames_encoded = 7;
+
+  EXPECT_CALL(*voice_media_channel, GetStats(_))
+      .WillOnce(DoAll(SetArgPointee<0>(voice_media_info), Return(true)));
+  EXPECT_CALL(*video_media_channel, GetStats(_))
+      .WillOnce(DoAll(SetArgPointee<0>(video_media_info), Return(true)));
+
+  SessionStats session_stats;
+  session_stats.proxy_to_transport["VoiceContentName"] = "TransportName";
+  session_stats.proxy_to_transport["VideoContentName"] = "TransportName";
+  session_stats.transport_stats["TransportName"].transport_name =
+      "TransportName";
+
+  // Make sure the associated |RTCTransportStats| is created.
+  cricket::TransportChannelStats channel_stats;
+  channel_stats.component = cricket::ICE_CANDIDATE_COMPONENT_RTP;
+  session_stats.transport_stats["TransportName"].channel_stats.push_back(
+      channel_stats);
+
+  EXPECT_CALL(test_->session(), GetStats(_)).WillRepeatedly(Invoke(
+      [&session_stats](const ChannelNamePairs&) {
+        return std::unique_ptr<SessionStats>(new SessionStats(session_stats));
+      }));
+  EXPECT_CALL(test_->session(), voice_channel())
+      .WillRepeatedly(Return(&voice_channel));
+  EXPECT_CALL(test_->session(), video_channel())
+      .WillRepeatedly(Return(&video_channel));
+
+  rtc::scoped_refptr<const RTCStatsReport> report = GetStatsReport();
+
+  RTCOutboundRTPStreamStats expected_audio(
+      "RTCOutboundRTPAudioStream_1", report->timestamp_us());
+  expected_audio.ssrc = 1;
+  expected_audio.is_remote = false;
+  expected_audio.media_type = "audio";
+  expected_audio.transport_id = "RTCTransport_TransportName_" +
+      rtc::ToString<>(cricket::ICE_CANDIDATE_COMPONENT_RTP);
+  expected_audio.codec_id = "RTCCodec_OutboundAudio_42";
+  expected_audio.packets_sent = 2;
+  expected_audio.bytes_sent = 3;
+  // |expected_audio.round_trip_time| should be undefined.
+
+  ASSERT_TRUE(report->Get(expected_audio.id()));
+  const RTCOutboundRTPStreamStats& audio = report->Get(
+      expected_audio.id())->cast_to<RTCOutboundRTPStreamStats>();
+  EXPECT_EQ(audio, expected_audio);
+
+  RTCOutboundRTPStreamStats expected_video(
+      "RTCOutboundRTPVideoStream_1", report->timestamp_us());
+  expected_video.ssrc = 1;
+  expected_video.is_remote = false;
+  expected_video.media_type = "video";
+  expected_video.transport_id = "RTCTransport_TransportName_" +
+      rtc::ToString<>(cricket::ICE_CANDIDATE_COMPONENT_RTP);
+  expected_video.codec_id = "RTCCodec_OutboundVideo_42";
+  expected_video.fir_count = 2;
+  expected_video.pli_count = 3;
+  expected_video.nack_count = 4;
+  expected_video.packets_sent = 5;
+  expected_video.bytes_sent = 6;
+  expected_video.frames_encoded = 7;
+  // |expected_video.round_trip_time| should be undefined.
+  // |expected_video.qp_sum| should be undefined.
+
+  ASSERT_TRUE(report->Get(expected_video.id()));
+  const RTCOutboundRTPStreamStats& video = report->Get(
+      expected_video.id())->cast_to<RTCOutboundRTPStreamStats>();
+  EXPECT_EQ(video, expected_video);
+}
+
 TEST_F(RTCStatsCollectorTest, CollectRTCTransportStats) {
   std::unique_ptr<cricket::Candidate> rtp_local_candidate = CreateFakeCandidate(
       "42.42.42.42", 42, "protocol", cricket::LOCAL_PORT_TYPE, 42);