Adding full initial version of delay estimation functionality in echo canceller 3

webrtc/modules/audio_processing/aec3/render_delay_controller.cc

Index: webrtc/modules/audio_processing/aec3/render_delay_controller.cc
diff --git a/webrtc/modules/audio_processing/aec3/render_delay_controller.cc b/webrtc/modules/audio_processing/aec3/render_delay_controller.cc
index f8834a5d7e1cccf1b21b0559b1afc17cfcdcb70e..e7b92bcf6efd227f57e0fe3e1a5b5db352c0da57 100644
--- a/webrtc/modules/audio_processing/aec3/render_delay_controller.cc
+++ b/webrtc/modules/audio_processing/aec3/render_delay_controller.cc
@@ -124,8 +124,7 @@ RenderDelayControllerImpl::RenderDelayControllerImpl(
       delay_(render_delay_buffer.Delay()),
       render_buffer_(render_delay_buffer.MaxApiJitter() + 1),
       delay_estimator_(data_dumper_.get(), sample_rate_hz) {
-  RTC_DCHECK(sample_rate_hz == 8000 || sample_rate_hz == 16000 ||
-             sample_rate_hz == 32000 || sample_rate_hz == 48000);
+  RTC_DCHECK(ValidFullBandRate(sample_rate_hz));
 }
 
 RenderDelayControllerImpl::~RenderDelayControllerImpl() = default;