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diff --git a/gfx/harfbuzz/src/hb-aat-map.hh b/gfx/harfbuzz/src/hb-aat-map.hh
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+/*
+ * Copyright © 2018  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_AAT_MAP_HH
+#define HB_AAT_MAP_HH
+
+#include "hb.hh"
+
+
+struct hb_aat_map_t
+{
+  friend struct hb_aat_map_builder_t;
+
+  public:
+
+  void init ()
+  {
+    memset (this, 0, sizeof (*this));
+    chain_flags.init ();
+  }
+  void fini () { chain_flags.fini (); }
+
+  public:
+  hb_vector_t<hb_mask_t> chain_flags;
+};
+
+struct hb_aat_map_builder_t
+{
+  public:
+
+  HB_INTERNAL hb_aat_map_builder_t (hb_face_t *face_,
+				    const hb_segment_properties_t *props_ HB_UNUSED) :
+				      face (face_) {}
+
+  HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value=1);
+
+  HB_INTERNAL void compile (hb_aat_map_t  &m);
+
+  public:
+  struct feature_info_t
+  {
+    hb_aat_layout_feature_type_t  type;
+    hb_aat_layout_feature_selector_t  setting;
+    bool is_exclusive;
+    unsigned  seq; /* For stable sorting only. */
+
+    HB_INTERNAL static int cmp (const void *pa, const void *pb)
+    {
+      const feature_info_t *a = (const feature_info_t *) pa;
+      const feature_info_t *b = (const feature_info_t *) pb;
+      if (a->type != b->type) return (a->type < b->type ? -1 : 1);
+      if (!a->is_exclusive &&
+	  (a->setting & ~1) != (b->setting & ~1)) return (a->setting < b->setting ? -1 : 1);
+	    return (a->seq < b->seq ? -1 : a->seq > b->seq ? 1 : 0);
+    }
+
+    /* compares type & setting only, not is_exclusive flag or seq number */
+    int cmp (const feature_info_t& f) const
+    {
+      return (f.type != type) ? (f.type < type ? -1 : 1) :
+	     (f.setting != setting) ? (f.setting < setting ? -1 : 1) : 0;
+    }
+  };
+
+  public:
+  hb_face_t *face;
+
+  public:
+  hb_sorted_vector_t<feature_info_t> features;
+};
+
+
+#endif /* HB_AAT_MAP_HH */