Support per-entry transforms in image-set API

Bug: skia:
Change-Id: I508ec8cb1df1c407853b401c73c66a575fb9c661
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/196642
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
7 files changed