[Hunspell] Add fuzzer for BDict::Verify

BUG=796935

Change-Id: Ib1ca8a5af6e57b3f8173d64383b33b636eaa613b
Reviewed-on: https://chromium-review.googlesource.com/905798Reviewed-by: Abhishek Arya <inferno@chromium.org>
Commit-Queue: Rachel Blum <groby@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534892}

third_party/hunspell/BUILD.gn

@@ -122,3 +122,14 @@ fuzzer_test("hunspell_fuzzer") {
   # This is a dictionary for the fuzzer, not a spellcheck dictionary.
   dict = "fuzz/hunspell.dict"
 }
+
+fuzzer_test("bdict_fuzzer") {
+  sources = [
+    "fuzz/bdict_fuzzer.cc",
+  ]
+  deps = [
+    ":hunspell",
+    "//base:base",
+  ]
+  seed_corpus = "fuzz/bdict_corpus"
+}

third_party/hunspell/fuzz/bdict_corpus/28ed3a797da3c48c309a4ef792147f3c56cfec40

+(
\ No newline at end of file

third_party/hunspell/fuzz/bdict_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 "third_party/hunspell/google/bdict.h"
+
+// Entry point for LibFuzzer.
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  hunspell::BDict::Verify(reinterpret_cast<const char*>(data), size);
+  return 0;
+}