[libfuzzer] Add fuzzer for third_party/hunspell with dictionary.

third_party/hunspell/BUILD.gn

 # Copyright 2014 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.
 
+import("//testing/libfuzzer/fuzzer_test.gni")
+
 config("hunspell_config") {
   defines = [
     "HUNSPELL_STATIC",
     "HUNSPELL_CHROME_CLIENT",
     "USE_HUNSPELL",
   ]
 }
 
 config("hunspell_warnings") {
   if (is_clang) {
@@ skipping 87 matching lines @@
     cflags += [
       # affentry.cxx has one `while ((p = nextchar(p)));` parsing loop.
       "-Wno-empty-body",
 
       # affentry.hxx has NULL as default parameter for a FLAG in two
       # places.
       "-Wno-null-conversion",
     ]
   }
 }
+
+fuzzer_test("hunspell_fuzzer") {
+  sources = [
+    "fuzz/hunspell_fuzzer.cc",

[please use gerrit instead, 2016/06/01 17:09:17]

Sources should include the header files, too. You would want changes in your
headers to cause a rebuild as well.

[mmoroz, 2016/06/02 10:54:36]

Done.

+  ]
+  deps = [
+    ":hunspell",
+  ]
+  dict = "fuzz/hunspell.dict"

[please use gerrit instead, 2016/06/01 17:09:17]

Either here or inside of hunspell.dict, explain that this "dict" is not a
spellcheck dictionary. It's confusing, because you're fuzzing a spellcheck
library, which has its own definition of what a dictionary is.

[mmoroz, 2016/06/02 10:54:35]

Done.

+}