Add quic_map_util.

net/quic/platform/api/quic_map_util.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_QUIC_PLATFORM_API_QUIC_MAP_UTIL_H_
+#define NET_QUIC_PLATFORM_API_QUIC_MAP_UTIL_H_
+
+#include "net/quic/platform/impl/quic_map_util_impl.h"
+
+namespace net {
+
+template <class Collection, class Key>
+bool QuicContainsKey(const Collection& collection, const Key& key) {
+  return QuicContainsKeyImpl(collection, key);
+}
+
+template <typename Collection, typename Value>
+bool QuicContainsValue(const Collection& collection, const Value& value) {
+  return QuicContainsValueImpl(collection, value);
+}
+
+}  // namespace net
+
+#endif  // NET_QUIC_PLATFORM_API_QUIC_MAP_UTIL_H_