The updated webrender doesn't take scroll IDs as part of the stacking context.
Instead, it has dedicated operations to push/pop scrolling layers. Since APZ
is currently disabled we don't really need this functionality. We will use it
in the future but for now we can remove the relevant code.
MozReview-Commit-ID: 9NpXvvgYSah
Since webrender now re-exports the servo-freetype-sys option as a feature,
we can opt out of having that in webrender_bindings and use the webrender as
unmodified.
This patch also updates the README as the in-tree webrender is now exactly
the same as upstream webrender, which simplifies future updates to webrender.
MozReview-Commit-ID: 6JBtgjWIcn2
Kartikaya Gupta
sotaro
JerryShih
Mason Chang
Morris Tseng