diff --git a/spdy/platform/api/spdy_containers.h b/spdy/platform/api/spdy_containers.h
index e4f4c49..9a90556 100644
--- a/spdy/platform/api/spdy_containers.h
+++ b/spdy/platform/api/spdy_containers.h
@@ -37,6 +37,12 @@
   return SpdyHashStringPairImpl(a, b);
 }
 
+// Used for maps that are typically small, then it is faster than (for example)
+// hash_map which is optimized for large data sets. SpdySmallMap upgrades itself
+// automatically to a SpdySmallMapImpl-specified map when it runs out of space.
+template <typename Key, typename Value, int Size>
+using SpdySmallMap = SpdySmallMapImpl<Key, Value, Size>;
+
 }  // namespace spdy
 
 #endif  // QUICHE_SPDY_PLATFORM_API_SPDY_CONTAINERS_H_
diff --git a/spdy/platform/api/spdy_map_util.h b/spdy/platform/api/spdy_map_util.h
new file mode 100644
index 0000000..e9b5f85
--- /dev/null
+++ b/spdy/platform/api/spdy_map_util.h
@@ -0,0 +1,19 @@
+// Copyright (c) 2019 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 QUICHE_SPDY_PLATFORM_API_SPDY_MAP_UTIL_H_
+#define QUICHE_SPDY_PLATFORM_API_SPDY_MAP_UTIL_H_
+
+#include "net/spdy/platform/impl/spdy_map_util_impl.h"
+
+namespace spdy {
+
+template <class Collection, class Key>
+bool SpdyContainsKey(const Collection& collection, const Key& key) {
+  return SpdyContainsKeyImpl(collection, key);
+}
+
+}  // namespace spdy
+
+#endif  // QUICHE_SPDY_PLATFORM_API_SPDY_MAP_UTIL_H_