Merge "Revert "Delete PanelViewController"" into tm-qpr-dev am: 97cf25f27e am: 088e2045cc

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

Change-Id: Ie22e8ff8bcc792ca64134ba05e2dd768a7a0b659
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>