Fix ETC1 support on iOS.

iOS doesn't support the ETC1 GL format, but does support ETC2 which has
ETC1 support as well. We should probably default to ETC2 in any case.

Change-Id: Ifd34fc602a1227f76316a8e27cf5555605c66840
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/241045
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
1 file changed