Wire up BWE stats through WebrtcSession so that they are filled in both for audio and video calls.

webrtc/media/engine/webrtcvideoengine2_unittest.cc

 /*
  *  Copyright (c) 2004 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 3571 matching lines @@
   stats2.media_bitrate_bps = 321;
   stats2.substreams[13].total_bitrate_bps = 5;
   stats2.substreams[13].retransmit_bitrate_bps = 6;
   stats2.substreams[21].total_bitrate_bps = 7;
   stats2.substreams[21].retransmit_bitrate_bps = 8;
   stream2->SetStats(stats2);
 
   cricket::VideoMediaInfo info;
   ASSERT_TRUE(channel_->GetStats(&info));
   ASSERT_EQ(2u, info.senders.size());
+  BandwidthEstimationInfo bwe_info;
+  channel_->FillBitrateInfo(&bwe_info);
   // Assuming stream and stream2 corresponds to senders[0] and [1] respectively
   // is OK as std::maps are sorted and AddSendStream() gives increasing SSRCs.
   EXPECT_EQ(stats.media_bitrate_bps, info.senders[0].nominal_bitrate);
   EXPECT_EQ(stats2.media_bitrate_bps, info.senders[1].nominal_bitrate);
   EXPECT_EQ(stats.target_media_bitrate_bps + stats2.target_media_bitrate_bps,
-            info.bw_estimations[0].target_enc_bitrate);
+            bwe_info.target_enc_bitrate);
   EXPECT_EQ(stats.media_bitrate_bps + stats2.media_bitrate_bps,
-            info.bw_estimations[0].actual_enc_bitrate);
-  EXPECT_EQ(1 + 3 + 5 + 7, info.bw_estimations[0].transmit_bitrate)
+            bwe_info.actual_enc_bitrate);
+  EXPECT_EQ(1 + 3 + 5 + 7, bwe_info.transmit_bitrate)
       << "Bandwidth stats should take all streams into account.";
-  EXPECT_EQ(2 + 4 + 6 + 8, info.bw_estimations[0].retransmit_bitrate)
+  EXPECT_EQ(2 + 4 + 6 + 8, bwe_info.retransmit_bitrate)
       << "Bandwidth stats should take all streams into account.";
 }
 
 TEST_F(WebRtcVideoChannel2Test, DefaultReceiveStreamReconfiguresToUseRtx) {
   EXPECT_TRUE(channel_->SetSendParameters(send_parameters_));
 
   const std::vector<uint32_t> ssrcs = MAKE_VECTOR(kSsrcs1);
   const std::vector<uint32_t> rtx_ssrcs = MAKE_VECTOR(kRtxSsrcs1);
 
   ASSERT_EQ(0u, fake_call_->GetVideoReceiveStreams().size());
@@ skipping 844 matching lines @@
 
 TEST_F(WebRtcVideoChannel2SimulcastTest,
        NoSimulcastScreenshareWithoutConference) {
   webrtc::test::ScopedFieldTrials override_field_trials_(
       "WebRTC-SimulcastScreenshare/Enabled/");
   VerifySimulcastSettings(cricket::VideoCodec("VP8"), 1280, 720, 3, 1, true,
                           false);
 }
 
 }  // namespace cricket