Build error with custom Webrender

[hgallagher1993]

Trying to build Servo with custom Webrender and Webrender_Api results in 2 build errors.

error[E0432]: unresolved import `webrender_api::ScrollEventPhase`
  --> components/compositing/compositor.rs:39:37
   |
39 | use webrender_api::{LayoutVector2D, ScrollEventPhase, ScrollLocation};
   |                                     ^^^^^^^^^^^^^^^^ no `ScrollEventPhase` in the root

error[E0204]: the trait `Copy` may not be implemented for this type
   --> components/compositing/compositor.rs:193:17
    |
193 | #[derive(Clone, Copy)]
    |                 ^^^^
...
202 |     phase: ScrollEventPhase,
    |     ----------------------- this field does not implement `Copy`

error: aborting due to 2 previous errors

Looks like ScrollEventPhase was removed in servo/webrender#2629.

[Eijebong]

Yeah webrender hasn't been synced since then. (Going to do it with #20497)