adding baseline options for super/sub scripting

ui/gfx/render_text_harfbuzz.h

Index: ui/gfx/render_text_harfbuzz.h
diff --git a/ui/gfx/render_text_harfbuzz.h b/ui/gfx/render_text_harfbuzz.h
index d3cba76d561514bc1da2c6947757b603ea51fe44..35ac7a3aa4fb77f34f397c9801b0c1bf81e784f5 100644
--- a/ui/gfx/render_text_harfbuzz.h
+++ b/ui/gfx/render_text_harfbuzz.h
@@ -70,6 +70,8 @@ struct GFX_EXPORT TextRunHarfBuzz {
   skia::RefPtr<SkTypeface> skia_face;
   FontRenderParams render_params;
   int font_size;
+  int baseline_offset;
+  int baseline_type;
   int font_style;
   bool strike;
   bool diagonal_strike;