add client util function for detecting borderless state
add client util function for detecting borderless state

FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,tizenorg/platform.upstream.enlightenment,tasn/enlightenment,tasn/enlightenment,tasn/enlightenment,rvandegrift/e,FlorentRevest/Enlightenment,FlorentRevest/Enlightenment,rvandegrift/e,tizenorg/platform.upstream.enlightenment,rvandegrift/e