Merge "Reduce overhead of activity launch observer" into tm-dev am: e0d21194 am: d853d209 am: c2cb6cbd am: 749d1548

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17937859



Change-Id: I61c99c1b225721e87b3d35215350f8a7879ecdd6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>