RTCOutboundRTPStreamStats.roundTripTime: Only report non-negative values.

webrtc/api/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 479 matching lines @@
     return verifier.ExpectAllMembersSuccessfullyTested();
   }
 
   bool VerifyRTCOutboundRTPStreamStats(
       const RTCOutboundRTPStreamStats& outbound_stream) {
     RTCStatsVerifier verifier(report_, &outbound_stream);
     VerifyRTCRTPStreamStats(outbound_stream, &verifier);
     verifier.TestMemberIsDefined(outbound_stream.packets_sent);
     verifier.TestMemberIsDefined(outbound_stream.bytes_sent);
     verifier.TestMemberIsUndefined(outbound_stream.target_bitrate);
-    verifier.TestMemberIsDefined(outbound_stream.round_trip_time);
+    // TODO(hbos): Defined in video but not audio case. Why? crbug.com/669877
+    verifier.MarkMemberTested(outbound_stream.round_trip_time, true);
     return verifier.ExpectAllMembersSuccessfullyTested();
   }
 
   bool VerifyRTCTransportStats(
       const RTCTransportStats& transport) {
     RTCStatsVerifier verifier(report_, &transport);
     verifier.TestMemberIsDefined(transport.bytes_sent);
     verifier.TestMemberIsDefined(transport.bytes_received);
     verifier.TestMemberIsOptionalIDReference(
         transport.rtcp_transport_stats_id, RTCTransportStats::kType);
@@ skipping 18 matching lines @@
 TEST_F(RTCStatsIntegrationTest, GetStatsFromCallee) {
   StartCall();
 
   rtc::scoped_refptr<const RTCStatsReport> report = GetStatsFromCallee();
   RTCStatsReportVerifier(report.get()).VerifyReport();
 }
 
 }  // namespace
 
 }  // namespace webrtc