Reland "C++ porting of the initial python script for conversational speech generation."

webrtc/modules/audio_processing/BUILD.gn

Index: webrtc/modules/audio_processing/BUILD.gn
diff --git a/webrtc/modules/audio_processing/BUILD.gn b/webrtc/modules/audio_processing/BUILD.gn
index 84f25b5e8ed7cfae29013af1fb8fba48e5805ef3..b20e3b5ad18d011cfe23d9fd58042dc35af6522c 100644
--- a/webrtc/modules/audio_processing/BUILD.gn
+++ b/webrtc/modules/audio_processing/BUILD.gn
@@ -475,6 +475,7 @@ if (rtc_include_tests) {
         ":audioproc_f",
         ":audioproc_unittest_proto",
         ":unpack_aecdump",
+        "test/conversational_speech",
         "test/py_quality_assessment",
       ]
     }