Bug 1676305 - cache allocated memory inside SWGL VBOs to speed up allocation. r=gw
Bug 1676305 - cache allocated memory inside SWGL VBOs to speed up allocation. r=gw

Differential Revision: https://phabricator.services.mozilla.com/D96496

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/20964901b7288c8d1206cc9f31799eae430e7ccc

servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender