Add transport security state generator tests.

net/http/transport_security_state_structs.h

+// Copyright (c) 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.
+
+#ifndef NET_HTTP_TRANSPORT_SECURITY_STATE_STRUCTS_H_
+#define NET_HTTP_TRANSPORT_SECURITY_STATE_STRUCTS_H_
+
+namespace net {
+
+struct Pinset {
+  const char* const* const accepted_pins;
+  const char* const* const rejected_pins;
+  const char* const report_uri;
+};
+
+}  // namespace net
+
+#endif  // NET_HTTP_TRANSPORT_SECURITY_STATE_STRUCTS_H_