Added support to bumpmap scale.

ScriptableRenderPipeline/LightweightPipeline/Editor/ShaderGUI/LightweightStandardGUI.cs

             public static GUIContent detailMaskText = new GUIContent("Detail Mask", "Mask for Secondary Maps (A)");
             public static GUIContent detailAlbedoText = new GUIContent("Detail Albedo x2", "Albedo (RGB) multiplied by 2");
             public static GUIContent detailNormalMapText = new GUIContent("Normal Map", "Normal Map");
+            public static GUIContent bumpScaleNotSupported = new GUIContent("Bump scale is not supported on mobile platforms");
+            public static GUIContent fixNow = new GUIContent("Fix now");
 
             public static string primaryMapsText = "Main Maps";
             public static string secondaryMapsText = "Secondary Maps";
 
         void DoNormalArea()
         {
-            m_MaterialEditor.TexturePropertySingleLine(Styles.normalMapText, bumpMap);
+            m_MaterialEditor.TexturePropertySingleLine(Styles.normalMapText, bumpMap, bumpMap.textureValue != null ? bumpScale : null);
+            if (bumpScale.floatValue != 1 && UnityEditorInternal.InternalEditorUtility.IsMobilePlatform(EditorUserBuildSettings.activeBuildTarget))
+                if (m_MaterialEditor.HelpBoxWithButton(Styles.bumpScaleNotSupported, Styles.fixNow))
+                    bumpScale.floatValue = 1;
         }
 
         void DoAlbedoArea(Material material)

ScriptableRenderPipeline/LightweightPipeline/Shaders/LightweightCore.cginc

     return inVec * rsqrt(dp3);
 }
 
+half3 UnpackNormalScale(half4 packednormal, half bumpScale)
+{
+#if defined(UNITY_NO_DXT5nm)
+    half3 normal = packednormal.xyz * 2 - 1;
+#if (SHADER_TARGET >= 30)
+    // SM2.0: instruction count limitation
+    // SM2.0: normal scaler is not supported
+    normal.xy *= bumpScale;
+#endif
+    return normal;
+#else
+    // This do the trick
+    packednormal.x *= packednormal.w;
+
+    half3 normal;
+    normal.xy = (packednormal.xy * 2 - 1);
+#if (SHADER_TARGET >= 30)
+    // SM2.0: instruction count limitation
+    // SM2.0: normal scaler is not supported
+    normal.xy *= bumpScale;
+#endif
+    normal.z = sqrt(1.0 - saturate(dot(normal.xy, normal.xy)));
+    return normal;
+#endif
+}
+
 half3 EvaluateSHPerVertex(half3 normalWS)
 {
 #if defined(EVALUATE_SH_VERTEX)

ScriptableRenderPipeline/LightweightPipeline/Shaders/LightweightPassLit.cginc

 sampler2D _MetallicGlossMap;
 half4 _SpecColor;
 sampler2D _SpecGlossMap;
+half _BumpScale;
 sampler2D _BumpMap;
 half _OcclusionStrength;
 sampler2D _OcclusionMap;
 half3 Normal(float2 uv)
 {
 #if _NORMALMAP
-    return UnpackNormal(tex2D(_BumpMap, uv));
+    return UnpackNormalScale(tex2D(_BumpMap, uv), _BumpScale);
 #else
     return half3(0.0h, 0.0h, 1.0h);
 #endif