[libfuzzer] Add ots_fuzzer for OpenTypeSanitizer.

third_party/ots/fuzz/ots_fuzzer.cc

Index: third_party/ots/fuzz/ots_fuzzer.cc
diff --git a/components/webcrypto/rsa_import_key_pkcs8_fuzzer.cc b/third_party/ots/fuzz/ots_fuzzer.cc
similarity index 52%
copy from components/webcrypto/rsa_import_key_pkcs8_fuzzer.cc
copy to third_party/ots/fuzz/ots_fuzzer.cc
index 184012299e576afa4f344f2a04c7762e27a78ca3..d52f1b64fd009a53b52ebad2f457c8262b8366ee 100644
--- a/components/webcrypto/rsa_import_key_pkcs8_fuzzer.cc
+++ b/third_party/ots/fuzz/ots_fuzzer.cc
@@ -5,11 +5,15 @@
 #include <stddef.h>
 #include <stdint.h>
 
-#include "components/webcrypto/fuzzer_support.h"
+#include "third_party/ots/include/opentype-sanitiser.h"
+#include "third_party/ots/include/ots-memory-stream.h"
+
+static uint8_t buffer[256 * 1024] = { 0 };
 
 // Entry point for LibFuzzer.
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-  webcrypto::ImportRsaKeyFromDerFuzzData(data, size,
-                                         blink::WebCryptoKeyFormatPkcs8);
+  ots::OTSContext context;
+  ots::MemoryStream stream(static_cast<void*>(buffer), sizeof(buffer));
+  context.Process(&stream, data, size);
   return 0;
 }