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When a session is created in OpenXR, it is not started until an OpenXR
event indicates that the session is ready to begin. However, WebXR
starts requesting frames as soon as the runtime is created. This calls
xrWaitFrame before the session has begun, which generates an OpenXR
error. This change keeps track of when the session is running, and only
calls xrWaitFrame when the session has begun. Otherwise, an empty frame
is returned to WebXR.

Bug: 1050729
Change-Id: I990457a349ba90395404b2adb3f14b3c21883bb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2275370Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Commit-Queue: Patrick To <patrto@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#786024}