This reverts commit 6789b82401.
Reason for revert: Failing CK test.
Original change's description:
> Fix directional shadows.
>
> The xy offset calculation for drawShadow was not quite correct. Rather
> than normalizing the light vector and using the xy values of that as the
> base offset value, we should scale the light vector by 1/z.
>
> See https://github.com/flutter/engine/pull/27124#issuecomment-880182653
> for more detail.
>
> Bug: skia:10781
> Change-Id: Ib69a313cb96a532f8d89644e3d69f666a184e897
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/428880
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Jim Van Verth <jvanverth@google.com>
TBR=jvanverth@google.com,bsalomon@google.com
Change-Id: Id22c2113fc1b62109975b83a0dcda5b1b16380a8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:10781
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/428977
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
3c8ae888b9