Add simple fuzzer for HttpAuthChallengeTokenizer

BUG=599584

Review-Url: https://codereview.chromium.org/2323913003
Cr-Commit-Position: refs/heads/master@{#417609}

net/BUILD.gn

@@ -2028,3 +2028,15 @@ fuzzer_test("net_url_request_fuzzer") {
   ]
   dict = "data/fuzzer_dictionaries/net_url_request_fuzzer.dict"
 }
+
+fuzzer_test("net_auth_challenge_tokenizer_fuzzer") {
+  sources = [
+    "http/http_auth_challenge_tokenizer_fuzzer.cc",
+  ]
+  deps = [
+    ":net_fuzzer_test_support",
+    ":test_support",
+    "//base",
+    "//net",
+  ]
+}

net/http/http_auth_challenge_tokenizer_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 <string>
+
+#include "net/http/http_auth_challenge_tokenizer.h"
+#include "net/http/http_util.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  std::string input(reinterpret_cast<const char*>(data), size);
+  net::HttpAuthChallengeTokenizer tokenizer(input.begin(), input.end());
+  net::HttpUtil::NameValuePairsIterator parameters = tokenizer.param_pairs();
+  while (parameters.GetNext()) {
+  }
+  tokenizer.base64_param();
+  return 0;
+}