Merge "Prefetch standalone system server jars before switching domain." am:...

Merge "Prefetch standalone system server jars before switching domain." am: 04b45b74 am: 16895824 am: 5a862711

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1909973

Change-Id: I76ef30d0aa75d697d9472df8b4d777663a86eeda