Remove SkClipStack's manual rounding of BW clip rects

The full fix for this bug is nudging the image in device space. That is going to be a large change. This CL should address the immediate problem.

This CL will alter the following GMs:
clipdrawdraw
convex_poly_clip
complexclip_bw_*
filltypespersp
complexclip3_simple

BUG=423834

Review URL: https://codereview.chromium.org/1033453003
1 file changed