add draw filter option to picture_bench

Option allows adding a draw filter option per type
or for all types. All SkPaint flags may be filtered,
plus disabling blur and setting the hint level.
Review URL: https://codereview.appspot.com/6816092

git-svn-id: http://skia.googlecode.com/svn/trunk@6318 2bbb7eff-a529-9590-31e7-b0007b416f81
4 files changed