Dawn backend: update to Skia API changes.

Update to GrProgramInfo change.
Implement GrCaps::bytesPerPixel().

Change-Id: Ic695fe85f2cd1389918724d17368df60f88ee2db
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/247796
Commit-Queue: Stephen White <senorblanco@chromium.org>
Reviewed-by: Robert Phillips <robertphillips@google.com>
14 files changed