[libfuzzer] Add ots_fuzzer for OpenTypeSanitizer.

third_party/ots/fuzz/ots_fuzzer.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #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;
 }