Update from https://crrev.com/316786

third_party/harfbuzz-ng/src/hb-buffer.h

 /*
  * Copyright © 1998-2004  David Turner and Werner Lemberg
  * Copyright © 2004,2007,2009  Red Hat, Inc.
  * 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
@@ skipping 235 matching lines @@
                      unsigned int    item_offset,
                      int             item_length);
 
 void
 hb_buffer_add_utf32 (hb_buffer_t    *buffer,
                      const uint32_t *text,
                      int             text_length,
                      unsigned int    item_offset,
                      int             item_length);
 
+/* Allows only access to first 256 Unicode codepoints. */
+void
+hb_buffer_add_latin1 (hb_buffer_t   *buffer,
+                      const uint8_t *text,
+                      int            text_length,
+                      unsigned int   item_offset,
+                      int            item_length);
+
 /* Like add_utf32 but does NOT check for invalid Unicode codepoints. */
 void
 hb_buffer_add_codepoints (hb_buffer_t          *buffer,
                           const hb_codepoint_t *text,
                           int                   text_length,
                           unsigned int          item_offset,
                           int                   item_length);
 
 
 /* Clears any new items added at the end */
@@ skipping 69 matching lines @@
                               const char *buf,
                               int buf_len, /* -1 means nul-terminated */
                               const char **end_ptr, /* May be NULL */
                               hb_font_t *font, /* May be NULL */
                               hb_buffer_serialize_format_t format);
 
 
 HB_END_DECLS
 
 #endif /* HB_BUFFER_H */