Convert 565 and 4444 bitmaps to 8888 for Mac Metal.

Fixes a large number of GMs.

Bug: skia:8243
Change-Id: I8053ac218d894205d36a3a3cdc8b7a7ea2e27e71
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/208320
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
1 file changed