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Background memory dumps are used for UMA reporting, and thread cache
stats are only reported for full ones. Collect them for all dumps, to
appear correctly in UMA.

Bug: 998048
Change-Id: I5810b839909ec94ed779d7b4034cbd53c13f0891
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2553552
Commit-Queue: Benoit L <lizeb@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831055}