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Use SoftwareOutputDevice for headless and pass on the full-pipeline flag to the
viz process and its DisplayScheduler.

Bug: 786067
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: Ief3a80777cf339b435724410f45ae64686c4beff
Reviewed-on: https://chromium-review.googlesource.com/960862
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543369}