tree a020340148525d59b0d1a22bc97e9ba0a348afd0
parent 7ba547cd2dfa8b05905fde8b77ec491cd0bc8dd1
author Tony Wickham <twickham@google.com> 1612989328 -0800
committer Tony Wickham <twickham@google.com> 1613517005 -0800

Draw folder leave-behind when opening folder in taskbar

Previously there was only support for CellLayout to draw the
leave-behind. Added FolderIconParent interface so any parent can
draw the leave-behind, and implement that by TaskbarView.

Test: Open folder in Taskber, ensure leave-behind draws

Bug: 171917176
Change-Id: I08d1d939a34f971f893994fe05cac972d165ef53