Create fuzzer tests for audio decoders

webrtc/test/fuzzers/audio_decoder_isacfix_fuzzer.cc

Index: webrtc/test/fuzzers/audio_decoder_isacfix_fuzzer.cc
diff --git a/webrtc/modules/audio_coding/codecs/isac/fix/source/audio_decoder_isacfix.cc b/webrtc/test/fuzzers/audio_decoder_isacfix_fuzzer.cc
similarity index 58%
copy from webrtc/modules/audio_coding/codecs/isac/fix/source/audio_decoder_isacfix.cc
copy to webrtc/test/fuzzers/audio_decoder_isacfix_fuzzer.cc
index 45eefb913b80ad4b87e83f7364e9e00baac450cb..83fb8c2d621cc78f78ce2e25d1b3769fb875cc7f 100644
--- a/webrtc/modules/audio_coding/codecs/isac/fix/source/audio_decoder_isacfix.cc
+++ b/webrtc/test/fuzzers/audio_decoder_isacfix_fuzzer.cc
@@ -9,12 +9,14 @@
  */
 
 #include "webrtc/modules/audio_coding/codecs/isac/fix/include/audio_decoder_isacfix.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<IsacFix>;
-
+void FuzzOneInput(const uint8_t* data, size_t size) {
+  AudioDecoderIsacFix dec(nullptr);
+  static const int kSampleRateHz = 16000;
+  static const size_t kAllocatedOuputSizeSamples = 16000 / 10;  // 100 ms.
+  int16_t output[kAllocatedOuputSizeSamples];
+  FuzzAudioDecoder(data, size, &dec, kSampleRateHz, sizeof(output), output);
+}
 }  // namespace webrtc