[libfuzzer] support of custom libfuzzer options via .options file.

testing/libfuzzer/gen_fuzzer_runner.py

-#!/usr/bin/python
-#
-# Copyright (c) 2015 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.
-
-"""Generate .sh runner for libfuzzer test.
-
-Invoked by GN from fuzzer_test.gni.
-"""
-
-import argparse
-import os
-import sys
-
-
-parser = argparse.ArgumentParser(description="Generate fuzzer launcher.")
-parser.add_argument('--fuzzer', required=True)
-parser.add_argument('--launcher', required=True)
-parser.add_argument('--dict', required=True)
-args = parser.parse_args()
-
-out = open(args.launcher, 'w')
-out.write("""#!/bin/bash
-set -ue
-DIR=$(dirname $0)
-$DIR/%(fuzzer)s -dict=$DIR/%(dict)s $*
-""" % { "fuzzer": args.fuzzer, "dict": args.dict })
-out.close()
-
-os.chmod(args.launcher, os.stat(args.launcher).st_mode | 0o111) # chmod a+x