When doing a readback in SkGrPixelRef check whether the dst bmp was allocated. Review URL: https://codereview.appspot.com/6936068
When doing a readback in SkGrPixelRef check whether the dst bmp was allocated.
Review URL: https://codereview.appspot.com/6936068

git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@6887 2bbb7eff-a529-9590-31e7-b0007b416f81

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