Add ability to supply initial bounds when docking task

Add an optional parameter in moveTaskToDockedStack to supply an
initial rect to be used when creating the dockeds tack. Pass in
the adjusted rect when dragging up from the navbar so it doesn't
flicker anymore.

Change-Id: Ieb3c8c73b9e2a769a2ec6270bd76a713201a2aed
13 files changed