Merge "Revert of Use dst copies in porter duffer XP to correctly render certain blends. (patchset #4 id:60001 of https://codereview.chromium.org/914003003/)" into master-skia

https://skia.googlesource.com/skia/+/2b816bacc0696f03d88c8060b21eda1e5cc7e8b1

Change-Id: I095e8816cba27c02fdb7fc830a52717339a1f926