Clone LocalFloatingToolbarPopup to RemoteSelectionToolbar

This change doesn't change the content of LocalFloatingToolbarPopup,
we just rename the file. This helps to review the follow up selction
toolbar service implementation change easier.

Bug: 190030331
Bug: 205823018
Test: build pass
Change-Id: I0a98fe7f2057fd3a04a408ab1acf1b4090515cb9