APM Quality Generator, noise generator and evaluation score workers factory + echo noise generator

webrtc/modules/audio_processing/test/py_quality_assessment/BUILD.gn

 # Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../../../../webrtc.gni")
 
@@ skipping 19 matching lines @@
   ]
 }  # py_quality_assessment
 
 copy("lib") {
   testonly = true
   sources = [
     "quality_assessment/__init__.py",
     "quality_assessment/audioproc_wrapper.py",
     "quality_assessment/data_access.py",
     "quality_assessment/eval_scores.py",
+    "quality_assessment/eval_scores_factory.py",
     "quality_assessment/eval_scores_unittest.py",
     "quality_assessment/evaluation.py",
     "quality_assessment/noise_generation.py",
+    "quality_assessment/noise_generation_factory.py",
     "quality_assessment/noise_generation_unittest.py",
     "quality_assessment/signal_processing.py",
     "quality_assessment/signal_processing_unittest.py",
     "quality_assessment/simulation.py",
   ]
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
   outputs = [
     "$root_build_dir/py_quality_assessment/quality_assessment/{{source_file_part}}",
   ]
   deps = [
@@ skipping 15 matching lines @@
 copy("output") {
   testonly = true
   sources = [
     "output/README.md",
   ]
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
   outputs = [
     "$root_build_dir/py_quality_assessment/output/{{source_file_part}}",
   ]
 }  # output