Added the ability to adjust the AEC3 performance for large rooms

webrtc/modules/audio_processing/aec3/echo_canceller3.cc

Index: webrtc/modules/audio_processing/aec3/echo_canceller3.cc
diff --git a/webrtc/modules/audio_processing/aec3/echo_canceller3.cc b/webrtc/modules/audio_processing/aec3/echo_canceller3.cc
index 4cd9c39729c2b3d2ae65660fabc0be0f8eff4849..3175c5414c0ae82295e94cea0f518d80f6049f34 100644
--- a/webrtc/modules/audio_processing/aec3/echo_canceller3.cc
+++ b/webrtc/modules/audio_processing/aec3/echo_canceller3.cc
@@ -200,11 +200,14 @@ void EchoCanceller3::RenderWriter::Insert(AudioBuffer* input) {
 
 int EchoCanceller3::instance_count_ = 0;
 
-EchoCanceller3::EchoCanceller3(int sample_rate_hz, bool use_highpass_filter)
+EchoCanceller3::EchoCanceller3(
+    const AudioProcessing::Config::EchoCanceller3& config,
+    int sample_rate_hz,
+    bool use_highpass_filter)
     : EchoCanceller3(sample_rate_hz,
                      use_highpass_filter,
                      std::unique_ptr<BlockProcessor>(
-                         BlockProcessor::Create(sample_rate_hz))) {}
+                         BlockProcessor::Create(config, sample_rate_hz))) {}
 EchoCanceller3::EchoCanceller3(int sample_rate_hz,
                                bool use_highpass_filter,
                                std::unique_ptr<BlockProcessor> block_processor)
@@ -331,7 +334,7 @@ std::string EchoCanceller3::ToString(
 
 bool EchoCanceller3::Validate(
     const AudioProcessing::Config::EchoCanceller3& config) {
-  return true;
+  return (config.echo_decay >= 0.f && config.echo_decay < 1.f);
 }
 
 void EchoCanceller3::EmptyRenderQueue() {