8be09b1ad408c13ef11e2ade669f32ac5c0479a5
Add some bindings to the private `CGSRegion` APIs. These enable us to tell the window server about the opaque regions of the window so that it can perform occlusion culling. See https://github.com/NUIKit/CGSInternal/blob/master/CGSRegion.h r? @metajack <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/core-graphics-rs/50) <!-- Reviewable:end -->
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