Cache gfx::RenderText instances in views::Label.

ui/gfx/harfbuzz_font_skia.cc

Index: ui/gfx/harfbuzz_font_skia.cc
diff --git a/ui/gfx/harfbuzz_font_skia.cc b/ui/gfx/harfbuzz_font_skia.cc
index 2eaa0b0f0aeaca287cd45a2014eb1f792177f735..4c15a91d2efe118c3a56e7eed6a8ca9cd766bf01 100644
--- a/ui/gfx/harfbuzz_font_skia.cc
+++ b/ui/gfx/harfbuzz_font_skia.cc
@@ -258,7 +258,7 @@ class HarfBuzzFace {
 hb_font_t* CreateHarfBuzzFont(SkTypeface* skia_face,
                               SkScalar text_size,
                               const FontRenderParams& params,
-                              bool background_is_transparent) {
+                              bool subpixel_rendering_enabled) {
   // TODO(ckocagil): This shouldn't grow indefinitely. Maybe use base::MRUCache?
   static std::map<SkFontID, FaceCache> face_caches;
 
@@ -273,7 +273,7 @@ hb_font_t* CreateHarfBuzzFont(SkTypeface* skia_face,
   hb_font_data->paint_.setTypeface(skia_face);
   hb_font_data->paint_.setTextSize(text_size);
   // TODO(ckocagil): Do we need to update these params later?
-  internal::ApplyRenderParams(params, background_is_transparent,
+  internal::ApplyRenderParams(params, subpixel_rendering_enabled,
                               &hb_font_data->paint_);
   hb_font_set_funcs(harfbuzz_font, g_font_funcs.Get().get(), hb_font_data,
                     DeleteByType<FontData>);