Revert "Revert "Use hairline when line width <= 1.0, instead of < 1.0.""

This reverts commit r560. Chromium has landed at r560, so I'm applying the
revert-revert. (See the comments in r560 for details.)

git-svn-id: http://skia.googlecode.com/svn/trunk@561 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed