Create fuzzer tests for audio decoders

webrtc/test/fuzzers/audio_decoder_isac_fuzzer.cc

Index: webrtc/test/fuzzers/audio_decoder_isac_fuzzer.cc
diff --git a/webrtc/modules/audio_coding/codecs/isac/main/source/audio_decoder_isac.cc b/webrtc/test/fuzzers/audio_decoder_isac_fuzzer.cc
similarity index 56%
copy from webrtc/modules/audio_coding/codecs/isac/main/source/audio_decoder_isac.cc
copy to webrtc/test/fuzzers/audio_decoder_isac_fuzzer.cc
index 8e0603e99ecd2ecdc06d52e8452cddf33f55caf6..984cfda398ce20367cd43a6e00d32120758a7595 100644
--- a/webrtc/modules/audio_coding/codecs/isac/main/source/audio_decoder_isac.cc
+++ b/webrtc/test/fuzzers/audio_decoder_isac_fuzzer.cc
@@ -9,12 +9,14 @@
  */
 
 #include "webrtc/modules/audio_coding/codecs/isac/main/include/audio_decoder_isac.h"
-
-#include "webrtc/modules/audio_coding/codecs/isac/audio_decoder_isac_t_impl.h"
+#include "webrtc/test/fuzzers/audio_decoder_fuzzer.h"
 
 namespace webrtc {
-
-// Explicit instantiation:
-template class AudioDecoderIsacT<IsacFloat>;
-
+void FuzzOneInput(const uint8_t* data, size_t size) {
+  AudioDecoderIsac dec(nullptr);
+  const int sample_rate_hz = size % 2 == 0 ? 16000 : 32000;     // 16 or 32 kHz.
+  static const size_t kAllocatedOuputSizeSamples = 32000 / 10;  // 100 ms.
+  int16_t output[kAllocatedOuputSizeSamples];
+  FuzzAudioDecoder(data, size, &dec, sample_rate_hz, sizeof(output), output);
+}
 }  // namespace webrtc