Revert "Revert "remove unused api on xfermodeimagefilter""

This reverts commit 369f7eaeb06f21b1cb15e3dd3204ed883c5376f5.

Reason for revert: google3 updated

Original change's description:
> Revert "remove unused api on xfermodeimagefilter"
> 
> This reverts commit fcc4a071d9dff4f3bac0bd55dab8f69a4436d15d.
> 
> Reason for revert: broke google3 roll.
> 
> Original change's description:
> > remove unused api on xfermodeimagefilter
> > 
> > Bug: skia:
> > Change-Id: If99ee7b4d959d728849a20ee43a0d0ec25196f58
> > Reviewed-on: https://skia-review.googlesource.com/20303
> > Reviewed-by: Mike Reed <reed@google.com>
> > Commit-Queue: Mike Reed <reed@google.com>
> 
> TBR=reed@google.com
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: skia:
> 
> Change-Id: I80e8b1e9009263a61230d22a988a9bb5ba7e162d
> Reviewed-on: https://skia-review.googlesource.com/20320
> Reviewed-by: Hal Canary <halcanary@google.com>
> Commit-Queue: Hal Canary <halcanary@google.com>

TBR=halcanary@google.com,reed@google.com

Change-Id: Icaa72fe6b1586cb76b37ab88ee1950628048d4ac
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/20312
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed