Merge "Add presubmit tests to gate ActivityManager and OomAdjuster changes." into udc-dev am: 3df941d5 am: 79668ec5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21960720



Change-Id: I368f372b34bfda8935ad89aa39507eb01d7cd0dc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>