Meiryo has same glyph for both normal style and italic/oblique style. Therefore, if we will use it as default Japanese font, italic/oblique style won't be used in Japanese text. It's too bad for <em>, <i> and backward compatibility with MS PGothic.
This patch makes gfxDWriteFontList and gfxGDIFontList ignore italic style face(s) of Meiryo at creating Meiryo's font face list.
Note that in GDI mode, font names are localized. Therefore, we need to compare with both English name and Japanese name. However, in DirectWrite mode, face names are not localized. Therefore, it's enough to compare only with English face names.
MozReview-Commit-ID: 60tFxB0jcd
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extra : rebase_source : 45eb61403f97cd765de1b81c290c29632d8174e5
Masayuki Nakano