Ramp shader with outline ?

My question is how could be possible to make this shader work with the toon outline ? Here is my shader :

 Shader "PaintBall TEST/Ramp_Bumped" {
 
     Properties {
 
         _RimColor ("Rim Color", Color) = (0.26,0.19,0.16,0.0)
 
         _RimPower ("Rim Power", Float) = 3
 
         _MainTex ("Texture", 2D) = "white" {}
 
         _BumpMap ("Bumpmap", 2D) = "bump" {}
 
         _RampTex ("Toon Ramp (RGB)", 2D) = "gray" {}
 
     }
 
 
 
     SubShader{
 
         Tags { "RenderType" = "Opaque" }
 
        
 
         CGPROGRAM
 
             #pragma surface surf Lambert
 
             #pragma target 3.0
 
 
 
             struct Input
 
             {
 
                 float2 uv_MainTex;
 
                 float3 worldNormal;
 
                 INTERNAL_DATA
 
             };
 
            
 
             sampler2D _MainTex, _BumpMap, _RampTex;
 
             float4 _RimColor;
 
             float _RimPower;
 
 
 
             void surf (Input IN, inout SurfaceOutput o)
 
             {
 
                 o.Albedo = tex2D(_MainTex, IN.uv_MainTex).rgb;
 
                 o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_MainTex));
 
                
 
                 half3 rim = pow(max(0, dot(float3(0, 1, 0), WorldNormalVector (IN, o.Normal))), _RimPower) * _RimColor.rgb * _RimColor.a;
 
                 o.Emission = rim;
 
             }
 
         ENDCG
 
     }
 
     Fallback "Diffuse"
 
 }

So my question is how could be make a outline into this shader ? Sorry for my english .