Fix up row bytes for single level texture in GrResourceProvider.

Change-Id: I5419a79255f9e9cdb3322238bd0d3b14e88ef6e6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/226156
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed