Create fuzzer tests for audio decoders

webrtc/test/fuzzers/audio_decoder_opus_fuzzer.cc

Index: webrtc/test/fuzzers/audio_decoder_opus_fuzzer.cc
diff --git a/webrtc/test/fuzzers/vp8_qp_parser_fuzzer.cc b/webrtc/test/fuzzers/audio_decoder_opus_fuzzer.cc
similarity index 52%
copy from webrtc/test/fuzzers/vp8_qp_parser_fuzzer.cc
copy to webrtc/test/fuzzers/audio_decoder_opus_fuzzer.cc
index 5135f1a471ebc088e307441d2f45355d0dee6c9b..3d70ec507dfe5606120f6eb88d400e727d369ac9 100644
--- a/webrtc/test/fuzzers/vp8_qp_parser_fuzzer.cc
+++ b/webrtc/test/fuzzers/audio_decoder_opus_fuzzer.cc
@@ -7,11 +7,17 @@
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
-#include "webrtc/modules/video_coding/utility/vp8_header_parser.h"
+
+#include "webrtc/modules/audio_coding/codecs/opus/audio_decoder_opus.h"
+#include "webrtc/test/fuzzers/audio_decoder_fuzzer.h"
 
 namespace webrtc {
 void FuzzOneInput(const uint8_t* data, size_t size) {
-  int qp;
-  vp8::GetQp(data, size, &qp);
+  const size_t channels = (size % 2) + 1;  // 1 or 2 channels.
+  AudioDecoderOpus dec(channels);
+  const int kSampleRateHz = 48000;
+  const size_t kAllocatedOuputSizeSamples = kSampleRateHz / 10;  // 100 ms.
+  int16_t output[kAllocatedOuputSizeSamples];
+  FuzzAudioDecoder(data, size, &dec, kSampleRateHz, sizeof(output), output);
 }
 }  // namespace webrtc