Merge "Revert[2] "remove SK_SUPPORT_LEGACY_CLIP_REGIONOPS"" into master-skia

https://skia.googlesource.com/skia/+/c1f7774e8d327e3c98b4094c9c01d26e27013f71

Change-Id: I3efbef04e79243310c1306b0222923caf22fac71