• Make creation-time immediate texture upload explicit. 

    The current setup doesn't work with glTexStorage. Given that it's only
used for a few callers, it's cleanest to move it to an explicit call at
those sites.

Differential Revision: https://phabricator.services.mozilla.com/D8565
    @bholley
    bholley committed Oct 13, 2018
    b79e230