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On ChromeOS we have a kernel memory change which allows us to
fix the amount of page cache is available. This is primarily
used to try to keep the browser process resident while under
memory pressure to avoid user jank. This feature/experiment
will compare the performance of locking the browser text
directly while also lowering the min_filelist_kb kernel
tunable from https://crrev.com/c/1880966

For more context see go/min_filelist_kb

BUG=chromium:1014871
TESTED=On a betty image

Change-Id: I8fe9b3fd71b26c95097c71f42d6b2200ececbecc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885298Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Reviewed-by: George Burgess <gbiv@chromium.org>
Commit-Queue: Brian Geffon <bgeffon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711963}