Move tex storage flag to FormatInfo in GrGLCaps.

Change-Id: Ieeb881c2b96ecd482576cb587c05dda892675e5a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/225191
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2 files changed