[automerger skipped] Merge "Add feature flag for app hibernation." am: 7ae76a2f3f am: 8dece034b9 am: 71badc9b5b -s ours

am skip reason: Change-Id I27b4bdd9b6ed25b06fc685183f0dc872094f1b5c with SHA-1 68b31b017e is in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1542244

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I4cfb5fd20c29594ee828b926ee65ff31af1c94b9