Put the prior and edited(upgraded) routes on the map at the same time

[Xin-Zheng]

Chris said we can put the prior and edited(upgraded) routes on the map at the same time. When the users do the point to point version, if they change the parameter of corridor, the route may change due to the service change. So it maybe helpful to show the two routes at the same time if the browserchrone can let us do that.