SkLiteDL: thread the original canvas matrix through for SetMatrix::Draw().

SkLiteDL: thread the original canvas matrix through for SetMatrix::Draw().

The SkLiteDL is recorded in some identity space (imagine, SkMatrix::I()),
but played back in a different one (here named SkMatrix original).  Any
calls to setMatrix() need to be made relative to this new space.

All other ops already operate in relative coordinates.

This should let us not fiddle with setMatrix().

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2247353003

Review-Url: https://codereview.chromium.org/2247353003