Roll HarfBuzz to 1.2.6

third_party/harfbuzz-ng/src/hb-ot-shape-fallback.cc

 /*
  * Copyright © 2011,2012  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.
@@ skipping 508 matching lines @@
         case t::SPACE_EM_16:
           pos[i].x_advance = (font->x_scale + ((int) space_type)/2) / (int) space_type;
           break;
 
         case t::SPACE_4_EM_18:
           pos[i].x_advance = font->x_scale * 4 / 18;
           break;
 
         case t::SPACE_FIGURE:
           for (char u = '0'; u <= '9'; u++)
-            if (font->get_glyph (u, 0, &glyph))
+            if (font->get_nominal_glyph (u, &glyph))
             {
               pos[i].x_advance = font->get_glyph_h_advance (glyph);
               break;
             }
           break;
 
         case t::SPACE_PUNCTUATION:
-          if (font->get_glyph ('.', 0, &glyph))
+          if (font->get_nominal_glyph ('.', &glyph))
             pos[i].x_advance = font->get_glyph_h_advance (glyph);
-          else if (font->get_glyph (',', 0, &glyph))
+          else if (font->get_nominal_glyph (',', &glyph))
             pos[i].x_advance = font->get_glyph_h_advance (glyph);
           break;
 
         case t::SPACE_NARROW:
           /* Half-space?
            * Unicode doc http://www.unicode.org/charts/PDF/U2000.pdf says ~1/4 or 1/5 of EM.
            * However, in my testing, many fonts have their regular space being about that
            * size.  To me, a percentage of the space width makes more sense.  Half is as
            * good as any. */
           pos[i].x_advance /= 2;
           break;
       }
     }
 }