[DirectWrite] Force aliased rendering for PMingLiU at small sizes

Force full alaiased rendering for the PMingLiU font as sizes smaller than
11px as it is illegible with DW rendering at smaller sizes.

BUG=386682
R=cpu@chromium.org,pdr@chromium.org

Review URL: https://codereview.chromium.org/341383005

git-svn-id: svn://svn.chromium.org/blink/trunk@176871 bbb929c8-8fbe-4397-9dbb-9b2b20218538