mozilla/servo — pull request #646 by kmcallister (2013-07-30 20:56:06+00:00)
Title: First attempt at incremental layout

This is a first attempt at incremental layout. When recomputing styles, we compare old and new CSS properties to determine which layout steps can be skipped.

Since I'm new to Servo I'm not sure that my code matches the idioms of the project. Please don't hold back with review comments :)