Major AEC3 render pipeline changes

webrtc/modules/audio_processing/aec3/matched_filter_lag_aggregator.cc

Index: webrtc/modules/audio_processing/aec3/matched_filter_lag_aggregator.cc
diff --git a/webrtc/modules/audio_processing/aec3/matched_filter_lag_aggregator.cc b/webrtc/modules/audio_processing/aec3/matched_filter_lag_aggregator.cc
index 3734ed80e0fb26de07b1bda503fe4db6326bb5ee..4a0a935620db25118f109d88c4d6689881e44a45 100644
--- a/webrtc/modules/audio_processing/aec3/matched_filter_lag_aggregator.cc
+++ b/webrtc/modules/audio_processing/aec3/matched_filter_lag_aggregator.cc
@@ -23,6 +23,12 @@ MatchedFilterLagAggregator::MatchedFilterLagAggregator(
 
 MatchedFilterLagAggregator::~MatchedFilterLagAggregator() = default;
 
+void MatchedFilterLagAggregator::Reset() {
+  candidate_ = 0;
+  candidate_counter_ = 0;
+  std::fill(lag_updates_in_a_row_.begin(), lag_updates_in_a_row_.end(), 0.f);
+}
+
 rtc::Optional<size_t> MatchedFilterLagAggregator::Aggregate(
     rtc::ArrayView<const MatchedFilter::LagEstimate> lag_estimates) {
   RTC_DCHECK_EQ(lag_updates_in_a_row_.size(), lag_estimates.size());