Add real to elapsed offset to shell transition trace am: 541c4b60 am:...

Add real to elapsed offset to shell transition trace am: 541c4b60 am: 3c467056 am: 9fb472fb am: 39dbf6fb

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22988307



Change-Id: I64b061f2462286b2dacbe09d17cc77d03ab67583
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>