Disable blending when there is an effect that reads the dst and draw state blend is 1,0.

R=robertphillips@google.com

Review URL: https://codereview.chromium.org/15199008

git-svn-id: http://skia.googlecode.com/svn/trunk@9147 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed