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This CL switches the order notifying all contexts about context loss and
restarting the GPU process for the exit_on_context_lost GPU driver bug
workaround. This will ensure the contexts are lost before the process
exists.

Also add an early out so no new GPU channels are created while the GPU
process is exiting. There is no point in creating new GPU channels at
this point as it can only cause problems.

Bug: 1011420
Change-Id: I10294074cc9f2f087124f1cb68fedf22ed364a3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866408
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707390}