Add interval estimator to remote bitrate estimator

webrtc/modules/BUILD.gn

Index: webrtc/modules/BUILD.gn
diff --git a/webrtc/modules/BUILD.gn b/webrtc/modules/BUILD.gn
index 143c8ff315e0aa2fb197c4d64ab678af3519a4a3..b914cf4ba2808b52803d5199104231489c46b030 100644
--- a/webrtc/modules/BUILD.gn
+++ b/webrtc/modules/BUILD.gn
@@ -397,6 +397,7 @@ if (rtc_include_tests) {
       "congestion_controller/delay_based_bwe_unittest_helper.h",
       "congestion_controller/probe_bitrate_estimator_unittest.cc",
       "congestion_controller/probe_controller_unittest.cc",
+      "congestion_controller/probing_interval_estimator_unittest.cc",
       "congestion_controller/transport_feedback_adapter_unittest.cc",
       "media_file/media_file_unittest.cc",
       "module_common_types_unittest.cc",
@@ -404,6 +405,7 @@ if (rtc_include_tests) {
       "pacing/bitrate_prober_unittest.cc",
       "pacing/paced_sender_unittest.cc",
       "pacing/packet_router_unittest.cc",
+      "remote_bitrate_estimator/aimd_rate_control_unittest.cc",
       "remote_bitrate_estimator/include/mock/mock_remote_bitrate_estimator.h",
       "remote_bitrate_estimator/include/mock/mock_remote_bitrate_observer.h",
       "remote_bitrate_estimator/inter_arrival_unittest.cc",