Revert[2] "remove SK_SUPPORT_LEGACY_CLIP_REGIONOPS"

This reverts commit a129dfef2aaab0b5995cdf1ab7b2cdd41c29cf72.

BUG=skia:

Change-Id: I717de6e5fcd4516aa684b014b1414b0f82ac2b91
Reviewed-on: https://skia-review.googlesource.com/5722
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
74 files changed