Merge "Don't launch placeholder for bottom TaskFragment when waiting for top"...

Merge "Don't launch placeholder for bottom TaskFragment when waiting for top" into tm-dev am: d4011e0e am: cee1ecf3 am: 0c63f58b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17983784



Change-Id: Ic36f7133d05bd63167106c014b94901c7c9f01b0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>