Add transport security state generator tests.

net/http/transport_security_state_structs.h

Index: net/http/transport_security_state_structs.h
diff --git a/net/http/transport_security_state_structs.h b/net/http/transport_security_state_structs.h
new file mode 100644
index 0000000000000000000000000000000000000000..53e3d6a1c1dd7e268e85481ee2514005c590c644
--- /dev/null
+++ b/net/http/transport_security_state_structs.h
@@ -0,0 +1,18 @@
+// 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_