Make SkSurface::asyncRescaleAndRead use kStrict constraint

Also fix crash if SkSurface has no color space.

Bug: skia:8962
Change-Id: I5826ddb10daa46f286d2405b7229ea4f0aefa8f2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/214306
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
7 files changed