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Due to another optimization that I landed at the same time as the
original CL, one of the unit tests became invalid. This CL slightly
tunes the LocalSurfaceIds used in the original unittests.

A child should not be throttled if the parent is blocked on it.
Otherwise the parent is guaranteed to hit the deadline, causing jank.

TBR=kylechar@chromium.org

Bug: 933610
Change-Id: Iff450c568a904d14c9f00fad24f5748a08c6a505
Reviewed-on: https://chromium-review.googlesource.com/c/1482949
Commit-Queue: Saman Sami <samans@chromium.org>
Reviewed-by: Saman Sami <samans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634808}