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This new API is needed to support Android P. It's different in that it
has new process state values.

Bug: b:78125315
Test: Ensure oom scores are set properly for android apps
Change-Id: Idffe90f18e7feef2bd97ec58baf934ea3f304336
Reviewed-on: https://chromium-review.googlesource.com/1093890
Commit-Queue: Christopher Morin <cmtm@google.com>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566311}