DNCI [RenderText] Added font size options in RenderText.

ui/gfx/render_text_harfbuzz.cc

Index: ui/gfx/render_text_harfbuzz.cc
diff --git a/ui/gfx/render_text_harfbuzz.cc b/ui/gfx/render_text_harfbuzz.cc
index f34dce7e3fb4d8182d76b59b6244dc06c7a036c8..7f6de1fa5d0808bd26070929e303f81297bd27d0 100644
--- a/ui/gfx/render_text_harfbuzz.cc
+++ b/ui/gfx/render_text_harfbuzz.cc
@@ -1167,13 +1167,15 @@ void RenderTextHarfBuzz::ItemizeTextToRuns(
   DCHECK_LE(text.size(), baselines().max());
   for (const BreakList<bool>& style : styles())
     DCHECK_LE(text.size(), style.max());
-  internal::StyleIterator style(empty_colors, baselines(), styles());
+  internal::StyleIterator style(font_sizes(), empty_colors, baselines(),
+                                styles());
 
   for (size_t run_break = 0; run_break < text.length();) {
     internal::TextRunHarfBuzz* run = new internal::TextRunHarfBuzz;
     run->range.set_start(run_break);
     run->font_style = (style.style(BOLD) ? Font::BOLD : 0) |
                       (style.style(ITALIC) ? Font::ITALIC : 0);
+    run->font_size = style.font_size();
     run->baseline_type = style.baseline();
     run->strike = style.style(STRIKE);
     run->diagonal_strike = style.style(DIAGONAL_STRIKE);
@@ -1242,7 +1244,8 @@ void RenderTextHarfBuzz::ShapeRun(const base::string16& text,
                                   internal::TextRunHarfBuzz* run) {
   const Font& primary_font = font_list().GetPrimaryFont();
   const std::string primary_family = primary_font.GetFontName();
-  run->font_size = primary_font.GetFontSize();
+  if (run->font_size == 0)
+    run->font_size = primary_font.GetFontSize();
   run->baseline_offset = 0;
   if (run->baseline_type != NORMAL_BASELINE) {
     // Calculate a slightly smaller font. The ratio here is somewhat arbitrary.