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Previously WaitUntilEnded() would not install an on-error closure, and
so would fail to exit on pipeline errors, causing the test to hang
rather than fail.

WaitUntilEnded() now waits for either end or error, and EXPECTs a
PIPELINE_OK status before returning.

Also tweaked the naming of RunUntilIdle* to RunUntilQuit to avoid
confusion with the RunLoop::RunIntilIdle() API behaviour.

Bug: 836785
Change-Id: Idcf9bbec5ac0d7d78e2ba0530eaed0748a1626c8
Reviewed-on: https://chromium-review.googlesource.com/1041807Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555777}