Change SkBlurImageFilter to use fixed-point division. Yields ~1.8X speedup on
MacBookPro.

Note: this will require defining SK_DISABLE_BLUR_DIVISION_OPTIMIZATION in
Chrome, a la https://codereview.chromium.org/49973005.

R=mtklein@google.com

Review URL: https://codereview.chromium.org/57513002

git-svn-id: http://skia.googlecode.com/svn/trunk@12113 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed