Also renames PopupPanel to MoreKeysPanel Change-Id: I37209a5a8fe7dbba1eef03e3be88ba5253653926
The first key and the last of the row are automatically marked as left and right edge key respectively. The existence of Spacer will prevent those automatic marking. Bug: 5038844 Change-Id: Ie34169ceaf76e24923b8d8125eda6ecb95cf1fee
Bug: 4312114 Change-Id: I3feca4e87bdca0e4b5304fc325188e7eac115328