Add unittests for HSTS decoding.

net/http/transport_security_state_source.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_SOURCE_H_
+#define NET_HTTP_TRANSPORT_SECURITY_STATE_SOURCE_H_
+
+namespace net {
+
+struct TransportSecurityStateSource {
+  struct Pinset {
+    const char* const* const accepted_pins;
+    const char* const* const rejected_pins;
+    const char* const report_uri;
+  };
+
+  const uint8_t* huffman_tree;
+  size_t huffman_tree_size;
+  const uint8_t* preloaded_data;
+  size_t preloaded_bits;
+  size_t root_position;
+  const char* const* expect_ct_report_uris;
+  const char* const* expect_staple_report_uris;
+  const Pinset* pinsets;
+  size_t pinsets_count;
+};
+
+}  // namespace net
+
+#endif  // NET_HTTP_TRANSPORT_SECURITY_STATE_SOURCE_H_