Major AEC3 render pipeline changes

webrtc/modules/audio_processing/aec3/main_filter_update_gain.cc

Index: webrtc/modules/audio_processing/aec3/main_filter_update_gain.cc
diff --git a/webrtc/modules/audio_processing/aec3/main_filter_update_gain.cc b/webrtc/modules/audio_processing/aec3/main_filter_update_gain.cc
index f3531f0622a5b599595a60bee6fca01e7b66d562..dad1a7a2a77bc4902cb2a57300e9299bde5acbfe 100644
--- a/webrtc/modules/audio_processing/aec3/main_filter_update_gain.cc
+++ b/webrtc/modules/audio_processing/aec3/main_filter_update_gain.cc
@@ -41,7 +41,7 @@ void MainFilterUpdateGain::HandleEchoPathChange() {
 }
 
 void MainFilterUpdateGain::Compute(
-    const FftBuffer& render_buffer,
+    const RenderBuffer& render_buffer,
     const RenderSignalAnalyzer& render_signal_analyzer,
     const SubtractorOutput& subtractor_output,
     const AdaptiveFirFilter& filter,
@@ -49,7 +49,7 @@ void MainFilterUpdateGain::Compute(
     FftData* gain_fft) {
   RTC_DCHECK(gain_fft);
   // Introducing shorter notation to improve readability.
-  const FftBuffer& X_buffer = render_buffer;
+  const RenderBuffer& X_buffer = render_buffer;
   const FftData& E_main = subtractor_output.E_main;
   const auto& E2_main = subtractor_output.E2_main;
   const auto& E2_shadow = subtractor_output.E2_shadow;