Revert of Discard atlas after every MultiPictureDraw::draw (patchset #4 id:60001 of https://codereview.chromium.org/678403002/)

Reason for revert:
Breaking bots

Original issue's description:
> Discard atlas after every MultiPictureDraw::draw
>
> This is intended to prevent ghosting on tiled architectures.
>
> This CL also defers creation of the atlas (and its texture) until it is actually needed.
>
> Committed: https://skia.googlesource.com/skia/+/6d5b5455743414ddb11d2b8c1fe9d7959f2b853d

TBR=bsalomon@google.com
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/687233002
5 files changed