[API] SetWindow does not return result value

[Churchy Zheng]

API: SetWindow does not return result value.

according to Media_Dbus_Service_Function_Spec, it should have a return value after being invoked.
 (Spec desc: Bool SetWindow(XID xid)
  Set the media player GDK window's XID to the engine. The video will show on the window.
  Return true if media service's video output attaches to the media player's GDK window, otherwise return false..)

[donald (donald-wei)]

fixed in Gstreamer project 1.0.13

[Churchy Zheng (changqiu-zheng)]

always return True.
i think it can be seen as fixed as just one line code :
    def SetWindow(self, xid):
        self.xid = xid
        return True