Tests to make sure film strip and overview pane show if the other does not exist. http://crbug.com/723659

Overview should not be showing
Filmstrip should not be showing
Overview Showing: false
Filmstrip Showing: false

Overview should be showing
Filmstrip should not be showing
Overview Showing: true
Filmstrip Showing: false

Overview should not be showing
Filmstrip should be showing
Overview Showing: false
Filmstrip Showing: true

Overview should be showing
Filmstrip should be showing
Overview Showing: true
Filmstrip Showing: true