[OTS] Integrate WOFF 2.0 algorithm into OTS

src/gsub.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gsub.h"
 
 #include <limits>
 #include <vector>
 
 #include "gdef.h"
@@ skipping 45 matching lines @@
   {GSUB_TYPE_MULTIPLE, ParseMutipleSubstitution},
   {GSUB_TYPE_ALTERNATE, ParseAlternateSubstitution},
   {GSUB_TYPE_LIGATURE, ParseLigatureSubstitution},
   {GSUB_TYPE_CONTEXT, ParseContextSubstitution},
   {GSUB_TYPE_CHANGING_CONTEXT, ParseChainingContextSubstitution},
   {GSUB_TYPE_EXTENSION_SUBSTITUTION, ParseExtensionSubstitution},
   {GSUB_TYPE_REVERSE_CHAINING_CONTEXT_SINGLE,
     ParseReverseChainingContextSingleSubstitution}
 };
 
-// TODO(bashi): Port Chromium's arraysize macro and use it instead of sizeof().
 const ots::LookupSubtableParser kGsubLookupSubtableParser = {
-  sizeof(kGsubTypeParsers) / sizeof(kGsubTypeParsers[0]),
+  arraysize(kGsubTypeParsers),
   GSUB_TYPE_EXTENSION_SUBSTITUTION, kGsubTypeParsers
 };
 
 // Lookup Type 1:
 // Single Substitution Subtable
 bool ParseSingleSubstitution(const ots::OpenTypeFile *file,
                              const uint8_t *data, const size_t length) {
   ots::Buffer subtable(data, length);
 
   uint16_t format = 0;
@@ skipping 587 matching lines @@
 
   return true;
 }
 
 void ots_gsub_free(OpenTypeFile *file) {
   delete file->gsub;
 }
 
 }  // namespace ots