Merge "Port appsearch-service to the system_server_current sdk." into sc-dev...

Merge "Port appsearch-service to the system_server_current sdk." into sc-dev am: e665d39f am: 9e2d4748 am: e8440493

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14638445

Change-Id: I955d346514f96e9dc678119e0e80fe65b425542d