Add scripts to generate simple test data for certificate verification.

net/data/verify_certificate_chain_unittest/generate-target-signed-using-ecdsa.py

Index: net/data/verify_certificate_chain_unittest/generate-target-signed-using-ecdsa.py
diff --git a/net/data/verify_certificate_chain_unittest/generate-target-signed-using-ecdsa.py b/net/data/verify_certificate_chain_unittest/generate-target-signed-using-ecdsa.py
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+++ b/net/data/verify_certificate_chain_unittest/generate-target-signed-using-ecdsa.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 a trusted root using RSA, and intermediary using EC,
+and a target certificate using RSA. Verification is expected to succeed."""
+
+import common
+
+# Self-signed root certificate (part of trust store), using RSA.
+root = common.CreateSelfSignedRootCertificate('Root')
+
+# Intermediary using an EC key for the P-384 curve.
+intermediary = common.CreateIntermediaryCertificate('Intermediary', root)
+intermediary.GenerateEcKey('secp384r1')
+
+# Target certificate contains an RSA key (but is signed using ECDSA).
+target = common.CreateEndEntityCertificate('Target', intermediary)
+
+chain = [target, intermediary]
+trusted = [root]
+time = common.DEFAULT_TIME
+verify_result = True
+
+common.WriteTestFile(__doc__, chain, trusted, time, verify_result)