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Refactor XRSession logic to handle depth information into a separate
XRDepthManager to reduce the XRSession's responsibilities.

Make the XRDepthInformation object usable only during XRFrame (the frame
needs to be both active and animating). This allows us to reduce the
amount of copies (but means that multiple instances of
XRDepthInformation will share the same underlying depth buffer).

Change-Id: I1f709bd440ab771d2b96ebc55a3e15d7e9f25fc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575899
Commit-Queue: Piotr Bialecki <bialpio@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835925}