APM QA refactoring: render stream support, echo path simulation, new export engine

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 36 matching lines @@
     "$root_build_dir/py_quality_assessment/apm_configs/{{source_file_part}}",
   ]
 }  # apm_configs
 
 copy("lib") {
   testonly = true
   sources = [
     "quality_assessment/__init__.py",
     "quality_assessment/audioproc_wrapper.py",
     "quality_assessment/data_access.py",
+    "quality_assessment/echo_path_simulation.py",
+    "quality_assessment/echo_path_simulation_factory.py",
     "quality_assessment/eval_scores.py",
     "quality_assessment/eval_scores_factory.py",
     "quality_assessment/evaluation.py",
     "quality_assessment/exceptions.py",
     "quality_assessment/export.py",
+    "quality_assessment/input_mixer.py",
     "quality_assessment/results.css",
     "quality_assessment/results.js",
     "quality_assessment/signal_processing.py",
     "quality_assessment/simulation.py",
     "quality_assessment/test_data_generation.py",
     "quality_assessment/test_data_generation_factory.py",
   ]
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
   outputs = [
     "$root_build_dir/py_quality_assessment/quality_assessment/{{source_file_part}}",
@@ skipping 33 matching lines @@
   output_name = "py_quality_assessment/quality_assessment/fake_polqa"
   deps = [
     "../../../..:webrtc_common",
     "../../../../rtc_base:rtc_base_approved",
   ]
 }
 
 copy("lib_unit_tests") {
   testonly = true
   sources = [
+    "quality_assessment/echo_path_simulation_unittest.py",
     "quality_assessment/eval_scores_unittest.py",
+    "quality_assessment/input_mixer_unittest.py",
     "quality_assessment/signal_processing_unittest.py",
     "quality_assessment/simulation_unittest.py",
     "quality_assessment/test_data_generation_unittest.py",
   ]
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
   outputs = [
     "$root_build_dir/py_quality_assessment/quality_assessment/{{source_file_part}}",
   ]
 }
 
 copy("scripts_unit_tests") {
   testonly = true
   sources = [
     "apm_quality_assessment_unittest.py",
   ]
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
   outputs = [
     "$root_build_dir/py_quality_assessment/{{source_file_part}}",
   ]
 }