[libfuzzer] support multiple seed_corpus directories.

testing/libfuzzer/tests/check_seed_corpus_archive.py

Index: testing/libfuzzer/tests/check_seed_corpus_archive.py
diff --git a/testing/libfuzzer/tests/check_seed_corpus_archive.py b/testing/libfuzzer/tests/check_seed_corpus_archive.py
new file mode 100755
index 0000000000000000000000000000000000000000..5bbabd4e7107ba270f1aae471bb640bc9aad648e
--- /dev/null
+++ b/testing/libfuzzer/tests/check_seed_corpus_archive.py
@@ -0,0 +1,20 @@
+#!/usr/bin/python2
+# Copyright 2017 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.
+
+# Script that prints out number of files in given zip-archive. Used for testing.
+
+import ConfigParser
+import os
+import sys
+import zipfile
+
+seed_corpus_archive_path = os.path.join(os.path.dirname(sys.argv[0]),
+                                                        sys.argv[1])
+
+if not os.path.exists(seed_corpus_archive_path):
+  sys.exit(-1)
+
+archive = zipfile.ZipFile(seed_corpus_archive_path)
+sys.stdout.write('%d\n' % len(archive.namelist()))