Major AEC3 render pipeline changes

webrtc/modules/audio_processing/aec3/decimator_by_4.h

Index: webrtc/modules/audio_processing/aec3/decimator_by_4.h
diff --git a/webrtc/modules/audio_processing/aec3/decimator_by_4.h b/webrtc/modules/audio_processing/aec3/decimator_by_4.h
index 9a22dfcfed84c9f1e3b53bd8a95ce44d267817c9..5afc68118b7b7c01965b67e2e3ec37b8f77397c0 100644
--- a/webrtc/modules/audio_processing/aec3/decimator_by_4.h
+++ b/webrtc/modules/audio_processing/aec3/decimator_by_4.h
@@ -26,8 +26,7 @@ class DecimatorBy4 {
   DecimatorBy4();
 
   // Downsamples the signal.
-  void Decimate(rtc::ArrayView<const float> in,
-                std::array<float, kSubBlockSize>* out);
+  void Decimate(rtc::ArrayView<const float> in, rtc::ArrayView<float> out);
 
  private:
   CascadedBiQuadFilter low_pass_filter_;