Kartikaya Gupta dc68784e43 Bug 1479757 - Switch to containerless scrolling for GeckoView+WR. r=botond
This changes the containerful scrolling pref to be an override pref
such that it is:
- always false on desktop (i.e. always use containerless there)
- always true in Fennec (i.e. never use containerless there)
- true in GeckoView if WebRender is disabled (i.e. only use
  containerless with WebRender).

The first two cases are the same as before; the last case is new.
Because we don't create layers with WR, the containerless vs
containerful distinction doesn't make much sense there, and we need to
implement a bunch of zooming glue in either case. So it makes sense to
go with the "way of the future" and keep it containerless.

Differential Revision: https://phabricator.services.mozilla.com/D8733

--HG--
extra : moz-landing-system : lando
2018-10-15 17:41:21 +00:00
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