[DirectWrite] Use aliased rendering for small font-sizes for some scripts

Force aliased (black and white bitmap) rendering for certain scripts at
small font sizes. This ensures that east asian scripts remain legible
at smaller font sizes while benefiting from improved rending quality
at larger sizes. This is a first step and will likely require tweaks.

R=cpu@chromium.org,dglazkov@chromium.org
BUG=357864

Review URL: https://codereview.chromium.org/217993002

git-svn-id: svn://svn.chromium.org/blink/trunk@170405 bbb929c8-8fbe-4397-9dbb-9b2b20218538