Further tuning for AEC3 for initial echo suppression and handling of echo path changes

webrtc/modules/audio_processing/aec3/aec_state.h

Index: webrtc/modules/audio_processing/aec3/aec_state.h
diff --git a/webrtc/modules/audio_processing/aec3/aec_state.h b/webrtc/modules/audio_processing/aec3/aec_state.h
index e3502b4a4f5b5e42ae0446e0bb305bc98747c285..56fee2cf8f52088e2478b9f4e5117f70a32f72b0 100644
--- a/webrtc/modules/audio_processing/aec3/aec_state.h
+++ b/webrtc/modules/audio_processing/aec3/aec_state.h
@@ -47,6 +47,10 @@ class AecState {
   // Returns whether the render signal is currently active.
   bool ActiveRender() const { return active_render_counter_ > 0; }
 
+  // Returns whether the number of active render blocks since an echo path
+  // change.
+  size_t ActiveRenderBlocks() const { return active_render_blocks_; }
+
   // Returns the ERLE.
   const std::array<float, kFftLengthBy2Plus1>& Erle() const {
     return erle_estimator_.Erle();
@@ -108,6 +112,7 @@ class AecState {
   ErleEstimator erle_estimator_;
   int echo_path_change_counter_;
   int active_render_counter_;
+  size_t active_render_blocks_ = 0;
   bool usable_linear_estimate_ = false;
   bool echo_leakage_detected_ = false;
   bool model_based_aec_feasible_ = false;