[DirectWrite] Set minimum anti-aliased font size on a per script basis

Change FontCacheSkiaWin to set the minimum font size for anti aliasing
on a per script basis and assign min sizes for Han, Hiragana, Katakana,
Hangul, and Bengali. The current values where chosen by picking the
minimum value for which Wikipedia in said script was legible and will
likely require further tweaking based on user input.

R=dglazkov@chromium.org
BUG=357864

Review URL: https://codereview.chromium.org/221153002

git-svn-id: svn://svn.chromium.org/blink/trunk@170608 bbb929c8-8fbe-4397-9dbb-9b2b20218538