Structure of BBR's implementation,some main classes and functions which are going to be used

webrtc/modules/remote_bitrate_estimator/test/bwe_test_framework.cc

Index: webrtc/modules/remote_bitrate_estimator/test/bwe_test_framework.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/test/bwe_test_framework.cc b/webrtc/modules/remote_bitrate_estimator/test/bwe_test_framework.cc
index f9313a6724dd8908b0aa7cd7dc99bd9d8109d9c3..15e759b65466a425515f7243eeaf2414775a4020 100644
--- a/webrtc/modules/remote_bitrate_estimator/test/bwe_test_framework.cc
+++ b/webrtc/modules/remote_bitrate_estimator/test/bwe_test_framework.cc
@@ -152,6 +152,14 @@ void MediaPacket::SetAbsSendTimeMs(int64_t abs_send_time_ms) {
     (1 << 18)) + 500) / 1000) & 0x00fffffful;
 }
 
+BbrBweFeedback::BbrBweFeedback(
+    int flow_id,
+    int64_t send_time_us,
+    int64_t latest_send_time_ms,
+    const std::vector<std::pair<uint64_t, int64_t>>& packet_feedback_vector)
+    : FeedbackPacket(flow_id, send_time_us, latest_send_time_ms),
+      packet_feedback_vector_(packet_feedback_vector) {}
+
 RembFeedback::RembFeedback(int flow_id,
                            int64_t send_time_us,
                            int64_t last_send_time_ms,