Adds a WebRTC browser_test with opus dtx enabled.

chrome/browser/media/webrtc_browsertest_perf.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/media/webrtc_browsertest_perf.h"
 
 #include <stddef.h>
 
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
@@ skipping 55 matching lines @@
 
   EXPECT_TRUE(pc_dict.GetString(Statistic("bytesSent", ssrc), &value));
   perf_test::PrintResult(
       "audio_bytes", modifier, "bytes_sent", value, "bytes", false);
   EXPECT_TRUE(pc_dict.GetString(Statistic("googJitterReceived", ssrc), &value));
   perf_test::PrintResult(
       "audio_tx", modifier, "goog_jitter_recv", value, "ms", false);
   EXPECT_TRUE(pc_dict.GetString(Statistic("googRtt", ssrc), &value));
   perf_test::PrintResult(
       "audio_tx", modifier, "goog_rtt", value, "ms", false);
+  EXPECT_TRUE(
+      pc_dict.GetString(Statistic("packetsSentPerSecond", ssrc), &value));
+  perf_test::PrintResult("audio_tx", modifier, "packets_sent_per_second", value,
+                         "packets", false);
 }
 
 static void MaybePrintResultsForVideoSend(
     const std::string& ssrc, const base::DictionaryValue& pc_dict,
     const std::string& modifier) {
   std::string value;
   if (!pc_dict.GetString(Statistic("googFrameRateSent", ssrc), &value)) {
     // Not a video send stream.
     return;
   }
@@ skipping 182 matching lines @@
   std::set<std::string>::const_iterator ssrc_iterator =
       ssrc_identifiers.begin();
   for (; ssrc_iterator != ssrc_identifiers.end(); ++ssrc_iterator) {
     const std::string& ssrc = *ssrc_iterator;
     MaybePrintResultsForAudioReceive(ssrc, pc_dict, modifier);
     MaybePrintResultsForVideoReceive(ssrc, pc_dict, video_modifier);
   }
 }
 
 }  // namespace test