Fix SkColorFilterImageFilter matrix optimization (cherry-pick of 3df05015efce95c306fb79c21efc77c79f1ac1ba).

The order of matrices passed to multiplication was wrong (apparently,
this optimization was only being tested with matrices which commute).

See Chrome bug http://crbug.com/378362

TBR=bungeman@google.com

Author: senorblanco@chromium.org

Review URL: https://codereview.chromium.org/371523002

BUG=skia:

Review URL: https://codereview.chromium.org/393563002
2 files changed