Chromium -> Mojo roll.

third_party/harfbuzz-ng/src/hb-ot-hmtx-table.hh

 /*
  * 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 39 matching lines @@
   DEFINE_SIZE_STATIC (4);
 };
 
 struct _mtx
 {
   static const hb_tag_t tableTag = HB_TAG('_','m','t','x');
 
   static const hb_tag_t hmtxTag = HB_OT_TAG_hmtx;
   static const hb_tag_t vmtxTag = HB_OT_TAG_vmtx;
 
-  inline bool sanitize (hb_sanitize_context_t *c) {
+  inline bool sanitize (hb_sanitize_context_t *c) const
+  {
     TRACE_SANITIZE (this);
     /* We don't check for anything specific here.  The users of the
      * struct do all the hard work... */
     return TRACE_RETURN (true);
   }
 
   public:
   LongMetric    longMetric[VAR];        /* Paired advance width and leading
                                          * bearing values for each glyph. The
                                          * value numOfHMetrics comes from
@@ skipping 23 matching lines @@
   static const hb_tag_t tableTag        = HB_OT_TAG_hmtx;
 };
 struct vmtx : _mtx {
   static const hb_tag_t tableTag        = HB_OT_TAG_vmtx;
 };
 
 } /* namespace OT */
 
 
 #endif /* HB_OT_HMTX_TABLE_HH */