tracinglib: new helper for naming flow scopes am: 32ce2d935d

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/systemui/+/3332353

Change-Id: I1528ff7c94ca615c6b8644d546246d619389248b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>