Updated VRPose.timestamp to use same casing as WebVR spec. Also changing type to DOMHighResTimeStamp (typedef for double), again to match the spec.

See relevant spec text here: https://w3c.github.io/webvr/#interface-vrpose

BUG=389343

Review-Url: https://codereview.chromium.org/2268893003
Cr-Commit-Position: refs/heads/master@{#413894}
3 files changed