Arithmetic mode now has the option of not validating the output color, which will allow multiple arithmetic operations to be done sequentially, without intermediate clamping. This is required for mimicking blink's current behavior.
BUG=skia:
R=senorblanco@google.com, senorblanco@chromium.org, reed@google.com, bsalomon@google.com
Author: sugoi@chromium.org
Review URL: https://codereview.chromium.org/
204543006
git-svn-id: http://skia.googlecode.com/svn/trunk@14031
2bbb7eff-a529-9590-31e7-
b0007b416f81