it's very helpful to see the list of clips and the way they affect a chased primitive
Example:
```
building clip chain instance with local rect TypedRect(1561.0×1968.0 at (-300.0,-300.0))
clip Rectangle(3840.0×1874.0, Clip) at (0.0,0.0) in space SpatialNodeIndex(1)
flags (empty), resulted in Partial
clip Rectangle(3840.0×1874.0, Clip) at (0.0,0.0) in space SpatialNodeIndex(2)
flags (empty), resulted in Partial
```
Differential Revision: https://phabricator.services.mozilla.com/D37137
--HG--
extra : moz-landing-system : lando