call lock-pixels once we know we're a sprite Review URL: https://codereview.appspot.com/6938058
call lock-pixels once we know we're a sprite
Review URL: https://codereview.appspot.com/6938058

git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@6819 2bbb7eff-a529-9590-31e7-b0007b416f81

Cue/skia,Cue/skia,Cue/skia,Cue/skia