Sets the current contents of the clipboard to the specified
transferable object and registers the specified clipboard owner
as the owner of the new contents.
Sets the current contents of the clipboard to the specified
transferable object and registers the specified clipboard owner
as the owner of the new contents. If there is an existing owner
registered, that owner is notified that it no longer holds ownership
of the clipboard contents.
Parameters:
content - the transferable object representing the clipboard content
owner - the object which owns the clipboard content