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ARCVM boards will have {system_ext,odm,product}_build.prop files in
/usr/share/arcvm/properties. This CL let Chrome process these files
in addition to the existing ones (default.prop, build.prop, and
vendor_build.prop).

When processing the files, this files also let Chrome replace
ro.<partition>.product.cpu.abilist* so that all abilist properties
have a single consistent value regardless of the <partition>.

BUG=b:162555733,b:162024174
TEST=components_unittests

Change-Id: I98e1a5118657b91171b63c6bcbe9f71d9d1fe6da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333580
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794771}