Merge "Revert "Delete PanelViewController"" into tm-qpr-dev am: 97cf25f27e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19802155

Change-Id: I01a62569a56112c1a15701e51b8b651cc7b18eef
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>