Add suppression for freetype rotation fix in advance of Skia change.

The proposed change to Skia is https://codereview.chromium.org/213153006 .
It is expected that the Skia change will affect all rotated text on linux
and android layout tests.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/228293009

git-svn-id: svn://svn.chromium.org/blink/trunk@171085 bbb929c8-8fbe-4397-9dbb-9b2b20218538