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Measure the rate in which PluginVM DLC is fallingback to rootfs resident
PluginVM. A good metric to have in order to determine a stable state of
DLC(s) to deem removal from rootfs in the future.

Bug: chromium:145814572
Test: unit_tests --gtest_filter=PluginVm*
Change-Id: Ib13aa2f6922954bc18f973abf746a3485d0980fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2004056
Commit-Queue: Jae Hoon Kim <kimjae@chromium.org>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732536}