Made shadows blurry (thru implementing variance mapping)

src/core/SkShadowShader.h

Index: src/core/SkShadowShader.h
diff --git a/src/core/SkShadowShader.h b/src/core/SkShadowShader.h
index 163d58acd7638f444d6937e4b2402634b91d50bd..75db0dd151b3f5a2cdcdb3cad3c254bf20886b5f 100644
--- a/src/core/SkShadowShader.h
+++ b/src/core/SkShadowShader.h
@@ -14,6 +14,18 @@
 class SkLights;
 class SkShader;
 
+struct SkShadowType {
+    SkScalar fShadowRadius;
+    SkScalar fBiasingConstant;
+    SkScalar fMinVariance;
+
+    enum BlurAlgorithm {
+        kNoBlur_BlurAlgorithm,
+        kVariance_BlurAlgorithm
+    };
+    BlurAlgorithm fBlurAlgorithm;
+};
+
 class SK_API SkShadowShader {
 public:
     /** This shader combines the diffuse color in 'diffuseShader' with the shadows
@@ -23,7 +35,8 @@ public:
     static sk_sp<SkShader> Make(sk_sp<SkShader> povDepthShader,
                                 sk_sp<SkShader> diffuseShader,
                                 sk_sp<SkLights> lights,
-                                int diffuseWidth, int diffuseHeight);
+                                int diffuseWidth, int diffuseHeight,
+                                SkShadowType sType);
 
     // The shadow shader supports any number of ambient lights, but only
     // 4 non-ambient lights (currently just refers to directional lights).