Add scripts to generate simple test data for certificate verification.

net/data/verify_certificate_chain_unittest/generate-unknown-root.py

Index: net/data/verify_certificate_chain_unittest/generate-unknown-root.py
diff --git a/net/data/verify_certificate_chain_unittest/generate-unknown-root.py b/net/data/verify_certificate_chain_unittest/generate-unknown-root.py
new file mode 100755
index 0000000000000000000000000000000000000000..89b5bd1543d90d8ad2be1102ffde7b97cbb54d48
--- /dev/null
+++ b/net/data/verify_certificate_chain_unittest/generate-unknown-root.py
@@ -0,0 +1,26 @@
+#!/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.
+
+"""Certificate chain with 1 intermediary, but the root is not in trust store.
+Verification is expected to fail because the final intermediary (Intermediary)
+does not chain to a known root."""
+
+import common
+
+# Self-signed root certificate, which is NOT added to the trust store.
+root = common.CreateSelfSignedRootCertificate('Root')
+
+# Intermediary certificate.
+intermediary = common.CreateIntermediaryCertificate('Intermediary', root)
+
+# Target certificate.
+target = common.CreateEndEntityCertificate('Target', intermediary)
+
+chain = [target, intermediary]
+trusted = []  # Note that this lacks |root|
+time = common.DEFAULT_TIME
+verify_result = False
+
+common.WriteTestFile(__doc__, chain, trusted, time, verify_result)