Further tuning for AEC3 for initial echo suppression and handling of echo path changes

webrtc/modules/audio_processing/aec3/power_echo_model.cc

Index: webrtc/modules/audio_processing/aec3/power_echo_model.cc
diff --git a/webrtc/modules/audio_processing/aec3/power_echo_model.cc b/webrtc/modules/audio_processing/aec3/power_echo_model.cc
index 8ad5486e0702e97badcbce6a3eb9806a024cca1f..9bdc971b9dc73f5c6d5327b4d7fc6f182c0805c3 100644
--- a/webrtc/modules/audio_processing/aec3/power_echo_model.cc
+++ b/webrtc/modules/audio_processing/aec3/power_echo_model.cc
@@ -28,7 +28,7 @@ void RecentMaximum(const FftBuffer& X_buffer,
   }
 }
 
-constexpr float kHInitial = 10.f;
+constexpr float kHInitial = 100.f;

[peah-webrtc, 2017/02/27 14:26:03]

An echo path can often have a gain of 20 dB so 10 dB was too small for an
initial gain.

 constexpr int kUpdateCounterInitial = 300;
 
 }  // namespace