Adds BBR field trial to CallTest.

Bug: webrtc:8415
Change-Id: Ie0db059390fe4e079f1faa90f74f4ef53b192b6f
Reviewed-on: https://webrtc-review.googlesource.com/92383
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24189}
diff --git a/test/call_test.h b/test/call_test.h
index b47377f..54be39a 100644
--- a/test/call_test.h
+++ b/test/call_test.h
@@ -195,6 +195,8 @@
       DegradationPreference::MAINTAIN_FRAMERATE;
 
   std::unique_ptr<FecControllerFactoryInterface> fec_controller_factory_;
+  std::unique_ptr<NetworkControllerFactoryInterface>
+      bbr_network_controller_factory_;
 
   test::FunctionVideoEncoderFactory fake_encoder_factory_;
   int fake_encoder_max_bitrate_ = -1;