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This CL establishes a connection between the XR and GPU processes
when the XR process gets created for the OpenXR runtime. Context lost
callbacks from viz::ContextProvider are handled by recreating the GPU
process connection.

A future change will use the connection to open a shared image for
the WebXR backbuffer. The shared image will allow the GPU process to
render directly into the XR backbuffer and avoid the copy + flip
operation we perform today.

Bug: 1131616
Change-Id: I46262927ce116f043c04828bed0299537f250e53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567411
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837927}