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sequence_manager: Speed up SequenceManagerPerfTests

In order to speed up performance waterfall iteration time, instead of
always running for 5 seconds in the SequenceManagerPerfTests, measure
the wall time cost of posting 100k tasks in various configurations. We
also only measure task queue scaling efficiency with specific types of
sequence manager configurations.

Bug: 897751
Change-Id: Iafd1d809bf5116912298b7cad10e00551939e601
Reviewed-on: https://chromium-review.googlesource.com/c/1315887Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605923}