cancel rAF for inline when immersive-ar starts #54
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The immersive-ar-session sample starts with an inline session and then adds another session for immersive-ar. It starts a rAF loop for each, resulting in double rendering.
The native implementation may implicitely cancel the rAF on the inline session, but that doesn't technically seem right. The webxr-polyfill does not do this.
This update cancels the inline rAF before starting the immersive rAF.