add is_input_object() to schema::Type
add is_input_object() to schema::Type

Reviewed By: ginfung

Differential Revision: D25925646

fbshipit-source-id: 4441e95a918bd18a1949ca78ac9f9433d8c995e9

josephsavona/relay,wincent/relay,yungsters/relay,wincent/relay,xuorig/relay,xuorig/relay,facebook/relay,facebook/relay,josephsavona/relay,kassens/relay,facebook/relay,josephsavona/relay,voideanvalue/relay,xuorig/relay,kassens/relay,kassens/relay,voideanvalue/relay,facebook/relay,facebook/relay,yungsters/relay,xuorig/relay,facebook/relay,atxwebs/relay,xuorig/relay,wincent/relay,kassens/relay,voideanvalue/relay,wincent/relay,wincent/relay,kassens/relay,yungsters/relay,voideanvalue/relay,wincent/relay,kassens/relay,xuorig/relay,voideanvalue/relay,atxwebs/relay,atxwebs/relay,voideanvalue/relay,atxwebs/relay