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Currently we report throughput to UKM at:
  1. 5 seconds after a sequence starts.
  2. Every 500 seconds after that as long as the sequence lasts.
The problem is that in many cases users stays on a page less than 500
seconds, and then we would only get the report for the first 5 seconds,
which can be heavily biased by the page loading time.

This CL is a temp solution to ignore the first 5 seconds, so instead
we will report throughput at:
  1. The second 5 seconds after a sequence starts.
  2. Every 500 seconds after that as long as the sequence lasts.

Bug: 1040634
Change-Id: I808b3ff56acce12c3a81e8fca5b7d472f4fcf4a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129014
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755463}