transform3d: Introduce Transform3D::project_to_2d to flatten a transform #310
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Need to use this for servo/webrender#3394.
The normalization of perspective is not necessary but Gecko does it as a
performance optimization, and ScaleOffset in WR wouldn't handle this.
See: https://bugzilla.mozilla.org/show_bug.cgi?id=1241161
But in any case I'm happy to teach ScaleOffset about that case instead if you
think it's better.
This change is