This trades quite a bit of complicated code in Servo for few more
messages and a significant performance improvement. In particular,
WebRender can search the entire display list at once instead of
ping-ponging down the pipeline tree. This allows us to send mouse
events to the correct pipeline immediately.
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Source-Repo: https://github.com/servo/servo
Source-Revision: ca08271345f78fa881c174545f5b69a8ccb78143
c8b72f7452