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This CL adds a new throughput test story, to test the cases where the
main thread is extremely jank, and that the throughput can be 0.

Bug: 1048187
Change-Id: Ifdd44d165652489de8b41965921801894fba86f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134929Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756493}