Bug 1556763 - Disable blend_equation_advanced on adreno devices. r=gw
Bug 1556763 - Disable blend_equation_advanced on adreno devices. r=gw

There appears to be a driver bug on android 8 and older where it does
not render correctly.

Differential Revision: https://phabricator.services.mozilla.com/D34618

[wrupdater] From https://hg.mozilla.org/mozilla-central/rev/6ac6838b4cd865dc2df270cea1c0255e1d9afe03

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