Only use payload size within the receive/send interval for bitrate probing.

webrtc/modules/congestion_controller/probe_bitrate_estimator_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 107 matching lines @@
   AddPacketFeedback(1, 1000, 70, 84);
   AddPacketFeedback(1, 1000, 75, 90);
 
   CheckResult(0, 1200000, 10, 90);
 
   AddPacketFeedback(0, 1000, 40, 60);
 
   EXPECT_EQ(1ul, results_.size());
 }
 
+// Requesting to sending padding can result in multiple packets being sent, but
+// all with the same timestamp.
+TEST_F(TestProbeBitrateEstimator, MultiplePaddingPackets) {
+  AddPacketFeedback(0, 1000, 0, 10);
+  AddPacketFeedback(0, 1000, 10, 40);
+  AddPacketFeedback(0, 200, 10, 43);
+  AddPacketFeedback(0, 1000, 20, 70);
+  AddPacketFeedback(0, 220, 20, 74);
+  AddPacketFeedback(0, 1000, 30, 85);
+
+  CheckResult(0, 353600, 10, 85);
+}
+
 }  // namespace webrtc