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These have been spiking a bit, and so to cut down on the noise, reduce
the rate at which we emit these to 1% of the previous total.

The UMA stats will still show the true numbers, and this should still
allow us to get urls to try to reproduce these cases that are failing in
the wild.

Bug: 879110
Change-Id: Ice743cfa10f460deaf806cd1b28d534f446ce975
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1612225Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Auto-Submit: enne <enne@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659746}