[libfuzzer] Add ots_fuzzer for OpenTypeSanitizer.

third_party/ots/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("ots_config") {
   include_dirs = [ "include" ]
 }
 
 source_set("ots") {
   sources = [
     "include/opentype-sanitiser.h",
     "include/ots-memory-stream.h",
     "src/cff.cc",
     "src/cff.h",
@@ skipping 65 matching lines @@
     "//third_party/zlib",
   ]
 
   if (is_win) {
     cflags = [
       "/wd4267",  # Conversion from size_t to 'type'.
       "/wd4334",  # 32-bit shift implicitly converted to 64-bits.
     ]
   }
 }
+
+fuzzer_test("ots_fuzzer") {
+  sources = [
+    "fuzz/ots_fuzzer.cc",
+  ]
+  deps = [
+    ":ots",
+  ]
+  libfuzzer_options = [ "max_len=16800" ]
+  seed_corpus = "//third_party/harfbuzz-ng/fuzz/seed_corpus"
+}