…jrmuizel

The texture array is currently grown layer by layer and we typically get to 3 or 4 layers over several frames by the time we are done loading a simple wikipedia page.

Differential Revision: https://phabricator.services.mozilla.com/D68056

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/167562affb96a1777609f6c6bb6f0a1dab520309