Adding second layer of the echo canceller 3 functionality.

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 b409e60350e2c2b6c45b2395d8a42d6285f92410..c360de48c11b35b38e4a28755b4ba02777397ec1 100644
--- a/webrtc/modules/audio_processing/aec3/echo_canceller3.cc
+++ b/webrtc/modules/audio_processing/aec3/echo_canceller3.cc
@@ -53,7 +53,7 @@ void FillSubFrameView(std::vector<std::vector<float>>* frame,
 
 void ProcessCaptureFrameContent(
     AudioBuffer* capture,
-    bool known_echo_path_change,
+    bool level_change,
     bool saturated_microphone_signal,
     size_t sub_frame_index,
     FrameBlocker* capture_blocker,
@@ -63,13 +63,13 @@ void ProcessCaptureFrameContent(
     std::vector<rtc::ArrayView<float>>* sub_frame_view) {
   FillSubFrameView(capture, sub_frame_index, sub_frame_view);
   capture_blocker->InsertSubFrameAndExtractBlock(*sub_frame_view, block);
-  block_processor->ProcessCapture(known_echo_path_change,
-                                  saturated_microphone_signal, block);
+  block_processor->ProcessCapture(level_change, saturated_microphone_signal,
+                                  block);
   output_framer->InsertBlockAndExtractSubFrame(*block, sub_frame_view);
 }
 
 void ProcessRemainingCaptureFrameContent(
-    bool known_echo_path_change,
+    bool level_change,
     bool saturated_microphone_signal,
     FrameBlocker* capture_blocker,
     BlockFramer* output_framer,
@@ -80,8 +80,8 @@ void ProcessRemainingCaptureFrameContent(
   }
 
   capture_blocker->ExtractBlock(block);
-  block_processor->ProcessCapture(known_echo_path_change,
-                                  saturated_microphone_signal, block);
+  block_processor->ProcessCapture(level_change, saturated_microphone_signal,
+                                  block);
   output_framer->InsertBlock(*block);
 }
 
@@ -275,8 +275,7 @@ void EchoCanceller3::AnalyzeCapture(AudioBuffer* capture) {
   }
 }
 
-void EchoCanceller3::ProcessCapture(AudioBuffer* capture,
-                                    bool known_echo_path_change) {
+void EchoCanceller3::ProcessCapture(AudioBuffer* capture, bool level_change) {
   RTC_DCHECK_RUNS_SERIALIZED(&capture_race_checker_);
   RTC_DCHECK(capture);
   RTC_DCHECK_EQ(1u, capture->num_channels());
@@ -296,20 +295,19 @@ void EchoCanceller3::ProcessCapture(AudioBuffer* capture,
     capture_highpass_filter_->Process(capture_lower_band);
   }
 
-  ProcessCaptureFrameContent(capture, known_echo_path_change,
-                             saturated_microphone_signal_, 0, &capture_blocker_,
-                             &output_framer_, block_processor_.get(), &block_,
-                             &sub_frame_view_);
+  ProcessCaptureFrameContent(
+      capture, level_change, saturated_microphone_signal_, 0, &capture_blocker_,
+      &output_framer_, block_processor_.get(), &block_, &sub_frame_view_);
 
   if (sample_rate_hz_ != 8000) {
     ProcessCaptureFrameContent(
-        capture, known_echo_path_change, saturated_microphone_signal_, 1,
+        capture, level_change, saturated_microphone_signal_, 1,
         &capture_blocker_, &output_framer_, block_processor_.get(), &block_,
         &sub_frame_view_);
   }
 
   ProcessRemainingCaptureFrameContent(
-      known_echo_path_change, saturated_microphone_signal_, &capture_blocker_,
+      level_change, saturated_microphone_signal_, &capture_blocker_,
       &output_framer_, block_processor_.get(), &block_);
 
   data_dumper_->DumpWav("aec3_capture_output", frame_length_,