Have multiple plotmgrs, one for each mask format.
Only flush/purge those strikes that match our format.

R=bsalomon@google.com

Review URL: https://codereview.chromium.org/24047005

git-svn-id: http://skia.googlecode.com/svn/trunk@11303 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed