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Currently today OpenXR event pump does not have a callback to the render
loop and instead setting a state for session end and relies on the next
frame to check that state.  This is not reliable as most of the time,
the frame pump stops after sessions ends and the state logic has race
condition inside that changes as the code churns. This change add an
explicit callback to notify the end of a XR session so that the render
loop can reliably trigger the blink callback on session's end.

Bug: 1148648
Change-Id: I5447b0d053bbc1d575c9b509edc0ca5d6f76bca8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2535852
Commit-Queue: Phu Le <phle@microsoft.com>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833802}