Moving the residual echo detector outside of band-scheme in APM

webrtc/modules/audio_processing/residual_echo_detector.h

Index: webrtc/modules/audio_processing/residual_echo_detector.h
diff --git a/webrtc/modules/audio_processing/residual_echo_detector.h b/webrtc/modules/audio_processing/residual_echo_detector.h
index ba0d0d3c2843aa5f61a6ba94677d678ae8e8d8d8..c319ffd219276c92ba0c780aaa027d1117c92718 100644
--- a/webrtc/modules/audio_processing/residual_echo_detector.h
+++ b/webrtc/modules/audio_processing/residual_echo_detector.h
@@ -21,6 +21,7 @@
 
 namespace webrtc {
 
+class ApmDataDumper;
 class AudioBuffer;
 class EchoDetector;
 
@@ -52,6 +53,8 @@ class ResidualEchoDetector {
   }
 
  private:
+  static int instance_count_;
+  std::unique_ptr<ApmDataDumper> data_dumper_;
   // Keep track if the |Process| function has been previously called.
   bool first_process_call_ = true;
   // Buffer for storing the power of incoming farend buffers. This is needed for