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Mac DefaultPassthroughCommandDecoder is ready to be finched, so we
need test coverage for both command decoders. This CL adds passthrough
test coverage for context_lost, screenshot_sync, pixel_skia_gold,
and maps_pixel_test.

Bug: chromium:982292
Bug: chromium:1090853
Change-Id: Ib264875dc22cf15efe3a9395424da8e30554a8a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2246630
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779892}