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Previously, frame data management and scheduling responsibilities were
somewhat split between the XR and XRFrameProvider classes. This CL moves
all of those responsibilities into XRFrameProvider, leaving XR with the
more high-level session management responsibilities. It also allows
each session to have a different frame data provider instead of trying
to reuse the same provider for all inline-local sessions (which is
not the way the browser process sees things).

Finally, it makes VROrientationDevice suspend the sensor once all
inline-local sessions have been closed, and resume it once another is
created.

Bug: 1004008, 970854
Change-Id: Ia87ac5883ee179aa964522fc955c36add43d1370
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849098
Commit-Queue: Will Cassella <cassew@google.com>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704769}