Merge "Skip home activity in removeUnreachableHiddenTasks" into udc-dev am: 4d88a9e2 am: 706d6161

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22508983



Change-Id: I7ee3c1b97f604a7d2d1aa96dde196303cdb4e2b5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>