Give enums in SkImageInfo an underlying type

According to goto.google.com/chrome-includes, SkImageInfo.h is a
somewhat expensive header to include. This makes it possible to
forward-declare these enums instead.

Bug: chromium:1227131,chromium:242216
Change-Id: I4e939449a8d3dfc3fa4c43999bcaecb3249bc0c8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/431056
Commit-Queue: Nico Weber <thakis@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed