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The WebVR 1.1 spec was updated to clarify the behavior of getFrameData.
Now, GetFrameData should return false unless called within a
VRDisplay.requestAnimationFrame callback.

BUG=736023

Change-Id: I14d9442a016817a78232ed7b1e71956c8dac614a
Reviewed-on: https://chromium-review.googlesource.com/578188Reviewed-by: Brandon Jones <bajones@chromium.org>
Commit-Queue: Bill Orr <billorr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487970}