Revert "Delete PanelViewController"

Revert submission 19668417

Reason for revert: b/244276156
Reverted Changes:
Ic77518871:Delete PanelViewController

Test: manually verified that it fixed the regression
Fixes: 243996703, 244276156

Change-Id: If1b9a21769f2a6699ebc17b11534afd32f5a7b2f
2 files changed