32907cfb38
Modify OOM adj classes a bit, to take into account the new heavy weight app type, and give "foreground services" their own category to have a bettery chance to manager them when things go wrong. Also add some new code to battery stats to keep a history of changes to the battery level. Change-Id: I29f5ab6938777e1a7eafd7d8c38b5e564cc9f96a