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: f73d0d76 am: 6f5a141c

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



Change-Id: I718135deb01c9a02c5f7e31aa31ebf0ca2947eb8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>