Improve bitrate probing for the audio-only case.

webrtc/modules/congestion_controller/delay_based_bwe_unittest.cc

 /*
  *  Copyright (c) 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 39 matching lines @@
   int64_t now_ms = clock_.TimeInMilliseconds();
   uint16_t seq_num = 0;
   // First burst sent at 8 * 1000 / 10 = 800 kbps, but with every other packet
   // not being paced which could mess things up.
   for (int i = 0; i < kNumProbes; ++i) {
     clock_.AdvanceTimeMilliseconds(5);
     now_ms = clock_.TimeInMilliseconds();
     IncomingFeedback(now_ms, now_ms, seq_num++, 1000, 0);
     // Non-paced packet, arriving 5 ms after.
     clock_.AdvanceTimeMilliseconds(5);
-    IncomingFeedback(now_ms, now_ms, seq_num++,
-                     PacedSender::kMinProbePacketSize + 1,
-                     PacketInfo::kNotAProbe);
+    IncomingFeedback(now_ms, now_ms, seq_num++, 100, PacketInfo::kNotAProbe);
   }
 
   EXPECT_TRUE(bitrate_observer_.updated());
   EXPECT_GT(bitrate_observer_.latest_bitrate(), 800000u);
 }
 
 TEST_F(DelayBasedBweTest, ProbeDetectionFasterArrival) {
   int64_t now_ms = clock_.TimeInMilliseconds();
   uint16_t seq_num = 0;
   // First burst sent at 8 * 1000 / 10 = 800 kbps.
@@ skipping 186 matching lines @@
 
 TEST_F(DelayBasedBweMedianSlopeExperimentTest, CapacityDropNegOffsetChange) {
   CapacityDropTestHelper(1, false, 1267, -30000);
 }
 
 TEST_F(DelayBasedBweMedianSlopeExperimentTest, CapacityDropOneStreamWrap) {
   CapacityDropTestHelper(1, true, 600, 0);
 }
 
 }  // namespace webrtc