Merge "Add in-task activity transition metrics" into udc-dev am: 648caea2...

Merge "Add in-task activity transition metrics" into udc-dev am: 648caea2 am: 24c9809f am: 2207ae2f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23211056



Change-Id: I68155c0bb25d4660bd4172d0202355dac859f4ea
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>