Roll HarfBuzz to 1.2.6

third_party/harfbuzz-ng/src/hb-coretext.cc

 /*
  * Copyright © 2012,2013  Mozilla Foundation.
  * Copyright © 2012,2013  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
@@ skipping 886 matching lines @@
          * Next, compare the CGFont to the one we used to create our fonts.
          * Even this doesn't work all the time.
          *
          * Finally, we compare PS names, which I don't think are unique...
          *
          * Looks like if we really want to be sure here we have to modify the
          * font to change the name table, similar to what we do in the uniscribe
          * backend.
          *
          * However, even that wouldn't work if we were passed in the CGFont to
-         * begin with.
-         *
-         * We might switch to checking PS name against "LastResort".  That would
-         * be safe for all fonts except for those named "Last Resort".  Might be
-         * better than what we have right now.
+         * construct a hb_face to begin with.
          *
          * See: http://github.com/behdad/harfbuzz/pull/36
+         *
+         * Also see: https://bugs.chromium.org/p/chromium/issues/detail?id=597098
          */
         bool matched = false;
         for (unsigned int i = 0; i < range_records.len; i++)
           if (range_records[i].font && CFEqual (run_ct_font, range_records[i].font))
           {
             matched = true;
             break;
           }
         if (!matched)
         {
@@ skipping 337 matching lines @@
 
 hb_bool_t
 _hb_coretext_aat_shape (hb_shape_plan_t    *shape_plan,
                         hb_font_t          *font,
                         hb_buffer_t        *buffer,
                         const hb_feature_t *features,
                         unsigned int        num_features)
 {
   return _hb_coretext_shape (shape_plan, font, buffer, features, num_features);
 }