SkLiteDL: much simpler to eliminate bitmaps in recorder.

This shouldn't be any significant change in behavior or performance,
but it leaves the code in SkLiteDL a bit simpler.

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2863

Change-Id: Ifb0023d56f7e9dae172d8021fb956b8fc9281b15
Reviewed-on: https://skia-review.googlesource.com/2863
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
3 files changed