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

webrtc/modules/congestion_controller/probe_bitrate_estimator_unittest.cc

Index: webrtc/modules/congestion_controller/probe_bitrate_estimator_unittest.cc
diff --git a/webrtc/modules/congestion_controller/probe_bitrate_estimator_unittest.cc b/webrtc/modules/congestion_controller/probe_bitrate_estimator_unittest.cc
index d895e32f58b7cd080d39ff17e8ba69b991e83f74..0c143b5efd8c1166f516468d5fc21b958c0c3600 100644
--- a/webrtc/modules/congestion_controller/probe_bitrate_estimator_unittest.cc
+++ b/webrtc/modules/congestion_controller/probe_bitrate_estimator_unittest.cc
@@ -123,4 +123,23 @@ TEST_F(TestProbeBitrateEstimator, IgnoreOldClusters) {
   EXPECT_EQ(measured_bps_, INVALID_BPS);
 }
 
+TEST_F(TestProbeBitrateEstimator, IgnoreSizeLastSendPacket) {
+  AddPacketFeedback(0, 1000, 0, 10);
+  AddPacketFeedback(0, 1000, 10, 20);
+  AddPacketFeedback(0, 1000, 20, 30);
+  AddPacketFeedback(0, 1000, 30, 40);
+  AddPacketFeedback(0, 1500, 40, 50);
+
+  EXPECT_NEAR(measured_bps_, 800000, 10);
+}
+
+TEST_F(TestProbeBitrateEstimator, IgnoreSizeFirstReceivePacket) {
+  AddPacketFeedback(0, 1500, 0, 10);
+  AddPacketFeedback(0, 1000, 10, 20);
+  AddPacketFeedback(0, 1000, 20, 30);
+  AddPacketFeedback(0, 1000, 30, 40);
+
+  EXPECT_NEAR(measured_bps_, 800000, 10);
+}
+
 }  // namespace webrtc