Add real to elapsed offset to shell transition trace am: 541c4b60 am: 3c467056 am: f73d0d76

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



Change-Id: I4c4490f99b81e4d96701aa43afede7ffc3dbeb9f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>