a1f4d07bfabd5b1e36f03b504c461a4b8142d332
Add universal key code constants <!-- Reviewable:start --> This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/core-graphics-rs/95) <!-- Reviewable:end -->
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