Font Face Synthetic Bold Italic

Test for https://bugs.webkit.org/show_bug.cgi?id=34147 If @font-face does not provide an explicit italic/bold variant, regular is used.

Ahem regular:

Ahem regular

Ahem synthetic bold:

Ahem synthetic bold

Ahem synthetic italic:

Ahem synthetic italic

Ahem synthetic bold italic:

Ahem synthetic bold italic