always allocate (only) the width of the clip for the AA row, since it will
already be clamped to 32K (our impl limit at the moment.)

add unittest to confirm this fix



git-svn-id: http://skia.googlecode.com/svn/trunk@3242 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed