Merge "Postpone headless app caching to after boot." into rvc-dev am:...

Merge "Postpone headless app caching to after boot." into rvc-dev am: fd910278 am: 4d704628 am: bf85c836 am: 2401a64e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11973241

Change-Id: I7900210a8a2933e8376a1a752fd686cb9676cd77