this is an attempt to handle tasks outside of the device bounds,
that belong to surfaces not establishing raster roots.

I suspect that the scaling we are now setting up in adjust_scale_for_max_surface_size
doesn't work properly, since the function was assumed to only affect the raster-rooted
surfaces. But it does fix the crash we have.

Differential Revision: https://phabricator.services.mozilla.com/D69654

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/745c38db6468c26d2ee4c0cdfc5f9ec0b6733db9