This doesn't resolve all the problems here but does substantially improve the situation. In particular, if the device-space stroke is greater than 1 in one axis and less than 1 in the other, the smaller side will still appear darker than expected.
Bug: 935303
Change-Id: I3ff9bc73cad5ad5b8e13ef5aa7b46bbf4835753b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/263024
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
