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While we figure out better solutions for interning, to make traces
useful we can decrease interning interval. Make this configurable by
experiments.

Change-Id: I9ad99ab3184362f81d9b7ba5bc217e9c8b1914bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716601
Commit-Queue: ssid <ssid@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680611}