New simulators to test BWE at low bitrates (15-50kbps range).

webrtc/modules/remote_bitrate_estimator/bwe_simulations.cc

Index: webrtc/modules/remote_bitrate_estimator/bwe_simulations.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/bwe_simulations.cc b/webrtc/modules/remote_bitrate_estimator/bwe_simulations.cc
index b671a13dbd1d9de5937864f260406b2ff777840d..485f7522a0ef54d29c401b19fe55e013361d17b9 100644
--- a/webrtc/modules/remote_bitrate_estimator/bwe_simulations.cc
+++ b/webrtc/modules/remote_bitrate_estimator/bwe_simulations.cc
@@ -178,6 +178,36 @@ TEST_P(BweSimulation, Choke200kbps30kbps200kbps) {
   RunFor(60 * 1000);
 }
 
+TEST_P(BweSimulation, PacerChoke50kbps15kbps50kbps) {
+  AdaptiveVideoSource source(0, 30, 300, 0, 0);
+  PacedVideoSender sender(&uplink_, &source, GetParam());
+  ChokeFilter filter(&uplink_, 0);
+  RateCounterFilter counter(&uplink_, 0, "Receiver", bwe_names[GetParam()]);
+  PacketReceiver receiver(&uplink_, 0, GetParam(), true, true);
+  filter.set_capacity_kbps(50);
+  filter.set_max_delay_ms(500);
+  RunFor(60 * 1000);
+  filter.set_capacity_kbps(15);
+  RunFor(60 * 1000);
+  filter.set_capacity_kbps(50);
+  RunFor(60 * 1000);
+}
+
+TEST_P(BweSimulation, Choke50kbps15kbps50kbps) {
+  AdaptiveVideoSource source(0, 30, 300, 0, 0);
+  VideoSender sender(&uplink_, &source, GetParam());
+  ChokeFilter filter(&uplink_, 0);
+  RateCounterFilter counter(&uplink_, 0, "Receiver", bwe_names[GetParam()]);
+  PacketReceiver receiver(&uplink_, 0, GetParam(), true, true);
+  filter.set_capacity_kbps(50);
+  filter.set_max_delay_ms(500);
+  RunFor(60 * 1000);
+  filter.set_capacity_kbps(15);
+  RunFor(60 * 1000);
+  filter.set_capacity_kbps(50);
+  RunFor(60 * 1000);
+}
+
 TEST_P(BweSimulation, GoogleWifiTrace3Mbps) {
   AdaptiveVideoSource source(0, 30, 300, 0, 0);
   VideoSender sender(&uplink_, &source, GetParam());