RenderTextMac: Cache the SkTypeface on the TextRun

ui/gfx/render_text_harfbuzz.h

 // Copyright 2014 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.
 
 #ifndef UI_GFX_RENDER_TEXT_HARFBUZZ_H_
 #define UI_GFX_RENDER_TEXT_HARFBUZZ_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 56 matching lines @@
   bool is_rtl;
   UBiDiLevel level;
   UScriptCode script;
 
   std::unique_ptr<uint16_t[]> glyphs;
   std::unique_ptr<SkPoint[]> positions;
   std::vector<uint32_t> glyph_to_char;
   size_t glyph_count;
 
   Font font;
-  skia::RefPtr<SkTypeface> skia_face;
+  sk_sp<SkTypeface> skia_face;
   FontRenderParams render_params;
   int font_size;
   int baseline_offset;
   int baseline_type;
   int font_style;
   bool strike;
   bool diagonal_strike;
   bool underline;
 
  private:
@@ skipping 186 matching lines @@
 
   // Fixed width of glyphs. This should only be set in test environments.
   float glyph_width_for_test_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderTextHarfBuzz);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_HARFBUZZ_H_