Added the ability to adjust the AEC3 performance for large rooms

This CL exposes the parameter for adjusting the AEC3 performance
for large rooms.

Bug: webrtc:7519
Review-Url: https://codereview.webrtc.org/2967603002
Cr-Commit-Position: refs/heads/master@{#18862}
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.cc b/webrtc/modules/audio_processing/audio_processing_impl.cc
index 39fb723..292611e 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.cc
+++ b/webrtc/modules/audio_processing/audio_processing_impl.cc
@@ -1881,8 +1881,8 @@
 
 void AudioProcessingImpl::InitializeEchoCanceller3() {
   if (capture_nonlocked_.echo_canceller3_enabled) {
-    private_submodules_->echo_canceller3.reset(
-        new EchoCanceller3(proc_sample_rate_hz(), true));
+    private_submodules_->echo_canceller3.reset(new EchoCanceller3(
+        config_.echo_canceller3, proc_sample_rate_hz(), true));
   } else {
     private_submodules_->echo_canceller3.reset();
   }