Reland of BWE allocation strategy

TBR=stefan@webrtc.org,alexnarest@webrtc.org

Bug: webrtc:8243
Change-Id: Ie68e4f414b2ac32ba4e64877cb250fabcb089a07
Reviewed-on: https://webrtc-review.googlesource.com/13940
Commit-Queue: Alex Narest <alexnarest@webrtc.org>
Reviewed-by: Alex Narest <alexnarest@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20369}

modules/remote_bitrate_estimator/test/bbr_paced_sender.h

@@ -68,6 +68,7 @@ class BbrPacedSender : public Pacer {
                     int64_t capture_time_ms,
                     size_t bytes,
                     bool retransmission) override;
+  void SetAccountForAudioPackets(bool account_for_audio) override {}
   int64_t TimeUntilNextProcess() override;
   void OnBytesAcked(size_t bytes) override;
   void Process() override;