GitLab

This is a reland of 126a1168

The fix in this change addresses compile errors on the
Oculus platform.

TBR=dcheng@chromium.org
dcheng@chromium.org: please review, though there are no
new changes to vr_service.mojom

Original change's description:
> Make XR FrameData and Environment mojo associated
>
> The XRFrameDataProvider now returns an associated
> XREnvironmentDataProvider interface so that the
> two share callback queues and thus allow strict
> ordering of the two interfaces. This is critical
> for frame synchronization between frames and the
> associated environment data.
>
> Note: We can't just mark the interfaceptrs for
> XRFrameDataProvider and
> XREnvironmentIntegrationProvider as associated
> in the XRSession struct. XRDevice implementations
> mostly live on separate threads from the
> XRFrameDataProviders, so we'd have extra thread
> hopping. For the VR headsets we explicitly live
> off the main thread to avoid latency, and because
> we do some work that may block the thread the
> XRFrameDataProvider lives on (for example waiting
> for vsync, or submitting frames to headset APIs).
>
> Bug: 867057, 876135, 843376
> Change-Id: If2fb62fcd185825209dec08e421df05f34d41c30
> Reviewed-on: https://chromium-review.googlesource.com/c/1171794
> Commit-Queue: Max Rebuschatis <lincolnfrog@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Bill Orr <billorr@chromium.org>
> Reviewed-by: Klaus Weidner <klausw@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#605545}

Bug: 867057, 876135, 843376
Change-Id: If76578ebabbb40d03a21f6f557c5d4c27f69fc38
Reviewed-on: https://chromium-review.googlesource.com/c/1324089
Commit-Queue: Max Rebuschatis <lincolnfrog@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606643}