Adding a way to disable SkOffsetImageFilter's optimized path in blink/chrome

BUG=
R=senorblanco@chromium.org, reed@google.com, sugoi@google.com

Author: sugoi@chromium.org

Review URL: https://codereview.chromium.org/54543005

git-svn-id: http://skia.googlecode.com/svn/trunk/src@12075 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed