Merge "Improve exception logging for system backup/restore" into sc-dev am:...

Merge "Improve exception logging for system backup/restore" into sc-dev am: 8f589c02 am: 89a02edc

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15123973

Change-Id: I9db6ffe46c53932b5c6af253553b8a47e2767fa2