Adds a basic fuzzer for Http2FrameDecoder.

Future improvements could include a dictionary or corpus.

PiperOrigin-RevId: 536391596
diff --git a/build/source_list.json b/build/source_list.json
index b3f0af3..ecfe4e2 100644
--- a/build/source_list.json
+++ b/build/source_list.json
@@ -1316,6 +1316,7 @@
   ],
   "fuzzers_srcs": [
     "quiche/common/structured_headers_fuzzer.cc",
+    "quiche/http2/decoder/http2_frame_decoder_fuzzer.cc",
     "quiche/quic/core/crypto/certificate_view_der_fuzzer.cc",
     "quiche/quic/core/crypto/certificate_view_pem_fuzzer.cc",
     "quiche/quic/core/qpack/fuzzer/qpack_decoder_fuzzer.cc",