De-flake VideoSendStreamTest.ReconfigureBitratesSetsEncoderBitratesCorrectly

BUG=webrtc:5382
R=pbos@webrtc.org, stefan@webrtc.org

Review URL: https://codereview.webrtc.org/1922483002 .

Cr-Commit-Position: refs/heads/master@{#12547}
diff --git a/webrtc/modules/bitrate_controller/bitrate_controller_impl.cc b/webrtc/modules/bitrate_controller/bitrate_controller_impl.cc
index bf60878..3c0d37c 100644
--- a/webrtc/modules/bitrate_controller/bitrate_controller_impl.cc
+++ b/webrtc/modules/bitrate_controller/bitrate_controller_impl.cc
@@ -122,6 +122,18 @@
   MaybeTriggerOnNetworkChanged();
 }
 
+void BitrateControllerImpl::SetBitrates(int start_bitrate_bps,
+                                        int min_bitrate_bps,
+                                        int max_bitrate_bps) {
+  {
+    rtc::CritScope cs(&critsect_);
+    bandwidth_estimation_.SetBitrates(start_bitrate_bps,
+                                      min_bitrate_bps,
+                                      max_bitrate_bps);
+  }
+  MaybeTriggerOnNetworkChanged();
+}
+
 void BitrateControllerImpl::SetReservedBitrate(uint32_t reserved_bitrate_bps) {
   {
     rtc::CritScope cs(&critsect_);