so that we can push both the text and the decoration to subpixel position. <rdar://problem/17272083>
Created attachment 232928 [details] Patch
Created attachment 232951 [details] Patch
Comment on attachment 232951 [details] Patch EWS testing
Comment on attachment 232951 [details] Patch Clearing flags on attachment: 232951 Committed r169898: <http://trac.webkit.org/changeset/169898>