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This should work like other platforms, and give a Viz process that
doesn't require a hardware GPU, e.g. for running tests on infra.

This fixes an infinite loop when --disable-gpu is passed in such builds,
where we try to start a GPU process but this is rejected by
GpuProcessStartAllowed() == false. This started happening (or at least
became severe enough to break our tests) after 966e62f6
("[scheduler] Enable prioritize until begin main frame by default.").

Change-Id: I67c4f819e0383950d1c876bc34b799fb794bd5e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304154Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789655}