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We currently report the 'slower thread' metric in the aggregated
top-level metrics (AllInteractions and AllSequences). But now that
we have a 'scrolling thread' metric, report that instead.

BUG=1035460

Change-Id: Ide012ecf9c92aeeaba86fcdfeb812958e85a0656
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2128370Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754658}