More or less implement RenderTextHarfBuzz

ui/gfx/render_text_pango.cc

 // Copyright (c) 2012 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 "ui/gfx/render_text_pango.h"
 
 #include <pango/pangocairo.h>
 #include <algorithm>
 #include <string>
 #include <vector>
@@ skipping 510 matching lines @@
       LayoutIndexToTextIndex(item->offset + item->length), CURSOR_BACKWARD);
   return SelectionModel(caret, CURSOR_FORWARD);
 }
 
 size_t RenderTextPango::GetGlyphTextIndex(PangoLayoutRun* run,
                                           int glyph_index) const {
   return LayoutIndexToTextIndex(run->item->offset +
                                 run->glyphs->log_clusters[glyph_index]);
 }
 
-RenderText* RenderText::CreateInstance() {
+RenderText* RenderText::CreateNativeInstance() {
   return new RenderTextPango;
 }
 
 }  // namespace gfx