Fix a bug that can occur when:
- Parent stacking context is considered redundant
- Parent stacking context has a transform
- Parent stacking context establishes a raster root
- Parent stacking context has a clip
- Child stacking context has a filter (or other feature requiring a surface)
In these cases, the clips would be incorrectly propagated to the
primitives inside the child stacking context, instead of applied
to the child stacking context surface itself. This can cause correctness
issues when raster roots are established, and potential performance
issues if raster roots are not established.
Differential Revision: https://phabricator.services.mozilla.com/D107024
fceee43490