When recreating a texture image to change a usage flag or the base/max
levels, this change directly places the levels of the previous image as
updates to the new image.  This is instead of copying the image to a
temp one and staging that.

Bug: angleproject:4835
Change-Id: Ibc210b9ff0e8d11cba10b1cd9ab262c8f706cea5
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2898417
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Charlie Lao <cclao@google.com>