Major AEC3 render pipeline changes

webrtc/modules/audio_processing/aec3/echo_remover.h

Index: webrtc/modules/audio_processing/aec3/echo_remover.h
diff --git a/webrtc/modules/audio_processing/aec3/echo_remover.h b/webrtc/modules/audio_processing/aec3/echo_remover.h
index f7ac50cec7b14584c204a4c1886307a4d343aa9b..4e25b2521512acd6e39cfa5f0bc2d3b48edbd243 100644
--- a/webrtc/modules/audio_processing/aec3/echo_remover.h
+++ b/webrtc/modules/audio_processing/aec3/echo_remover.h
@@ -15,6 +15,7 @@
 
 #include "webrtc/base/optional.h"
 #include "webrtc/modules/audio_processing/aec3/echo_path_variability.h"
+#include "webrtc/modules/audio_processing/aec3/render_buffer.h"
 
 namespace webrtc {
 
@@ -27,11 +28,11 @@ class EchoRemover {
   // Removes the echo from a block of samples from the capture signal. The
   // supplied render signal is assumed to be pre-aligned with the capture
   // signal.
-  virtual void ProcessBlock(
+  virtual void ProcessCapture(
       const rtc::Optional<size_t>& echo_path_delay_samples,
       const EchoPathVariability& echo_path_variability,
       bool capture_signal_saturation,
-      const std::vector<std::vector<float>>& render,
+      const RenderBuffer& render_buffer,
       std::vector<std::vector<float>>* capture) = 0;
 
   // Updates the status on whether echo leakage is detected in the output of the