use correct clipop names

pure enum renaming -- no logic change.

BUG=skia:3191
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel
TBR=

Review-Url: https://codereview.chromium.org/2751833010
Cr-Commit-Position: refs/heads/master@{#457248}
2 files changed