LexemeView: return PlaceholderEnabledView
A view's rendered HTML may still contain placeholders - not the case in
lexeme but interface changed.
Bug: T206863
Depends-On: I3a61b5261a0076f116b07299b55508f706625076
Change-Id: If864d1bbb8f7bcddb281e83298283dfc0b2f4f8f