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diff --git a/src/core/lib/slice/slice_hash_table.h b/src/core/lib/slice/slice_hash_table.h
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+/*
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GRPC_CORE_LIB_SLICE_SLICE_HASH_TABLE_H
+#define GRPC_CORE_LIB_SLICE_SLICE_HASH_TABLE_H
+
+#include "src/core/lib/transport/metadata.h"
+
+/** Hash table implementation.
+ *
+ * This implementation uses open addressing
+ * (https://en.wikipedia.org/wiki/Open_addressing) with quadratic
+ * probing (https://en.wikipedia.org/wiki/Quadratic_probing).
+ *
+ * The keys are \a grpc_slice objects.  The values are arbitrary pointers
+ * with a common vtable.
+ *
+ * Hash tables are intentionally immutable, to avoid the need for locking.
+ */
+
+typedef struct grpc_slice_hash_table grpc_slice_hash_table;
+
+typedef struct grpc_slice_hash_table_vtable {
+  void (*destroy_value)(grpc_exec_ctx *exec_ctx, void *value);
+  void *(*copy_value)(void *value);
+} grpc_slice_hash_table_vtable;
+
+typedef struct grpc_slice_hash_table_entry {
+  grpc_slice key;
+  void *value; /* Must not be NULL. */
+  const grpc_slice_hash_table_vtable *vtable;
+} grpc_slice_hash_table_entry;
+
+/** Creates a new hash table of containing \a entries, which is an array
+    of length \a num_entries.
+    Creates its own copy of all keys and values from \a entries. */
+grpc_slice_hash_table *grpc_slice_hash_table_create(
+    size_t num_entries, grpc_slice_hash_table_entry *entries);
+
+grpc_slice_hash_table *grpc_slice_hash_table_ref(grpc_slice_hash_table *table);
+void grpc_slice_hash_table_unref(grpc_exec_ctx *exec_ctx,
+                                 grpc_slice_hash_table *table);
+
+/** Returns the value from \a table associated with \a key.
+    Returns NULL if \a key is not found. */
+void *grpc_slice_hash_table_get(const grpc_slice_hash_table *table,
+                                const grpc_slice key);
+
+#endif /* GRPC_CORE_LIB_SLICE_SLICE_HASH_TABLE_H */