Feature implementation that will keep a FindInPageView in sync with a bound SessionState.
Binds this feature to the given SessionState. Until unbound the FindInPageView will be updated presenting the current “Find in Page” state.
Returns true if the back button press was handled and the feature unbound from a session.
Unbinds the feature from a previously bound SessionState. The FindInPageView will be cleared and not be updated to present the “Find in Page” state anymore.