Merge "Check task switch by comparing leaf task." into tm-dev am: f55e3645

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18425963



Change-Id: I86230165de0960adf18220eb50ec9aeb936c6b2f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>