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If a sequence does not have enough frames, then instead of discarding
them completely, retain the throughput-data, and accumulate them with
the throughput metrics of the subsequent sequences (of the same
interaction-type) until there are enough frames to report the metric.

Bug: 1031251
Change-Id: I4bbe1d0b024e04afd92677426a546699d9cc85d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1952529Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722588}