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
2 files changed