Auto merge of #23575 - asajeffrey:webvr-glwindow-eventloop, r=Manishearth

 Pass events loop to glwindow test webvr implementation

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Pass the event loop to the glwindow webvr test device, so it can implement keyboard controls. The matching rust-webvr PR is https://github.com/servo/rust-webvr/pull/84

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- [X] These changes do not require tests because this enables testing webvr pose

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