Add onDrawBitmapLattice(), avoid unnecessary bitmap->image copy

Add onDrawBitmapLattice(), avoid unnecessary bitmap->image copy

out/Release/nanobench --match Lattice --config gpu --ms 3000
3.42ms -> 17.2us

For reference, a loop over drawBitmapRects (which is what
Android currently does) is about 13us.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2205273003

Review-Url: https://codereview.chromium.org/2205273003