use expected name for setDrawLooper/getDrawLooper

Needed for future pipe cl.
Next cl should be to guard the looper entirely (since its deprecated)

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2326173002

TBR=

Review-Url: https://codereview.chromium.org/2326173002
2 files changed