Improve handling of FF vertex array state

R=robertphillips@google.com, jvanverth@google.com

Author: bsalomon@google.com

Review URL: https://chromiumcodereview.appspot.com/23542013

git-svn-id: http://skia.googlecode.com/svn/trunk@11154 2bbb7eff-a529-9590-31e7-b0007b416f81
6 files changed