Split distance vector into direction and magnitude components

src/gpu/GrOvalRenderer.cpp

Index: src/gpu/GrOvalRenderer.cpp
diff --git a/src/gpu/GrOvalRenderer.cpp b/src/gpu/GrOvalRenderer.cpp
index 527b96e2c64a7f88e8637f8458e1311ef6c99ae9..89e35a1d707d49160005db46d0d289b66fc7bfad 100644
--- a/src/gpu/GrOvalRenderer.cpp
+++ b/src/gpu/GrOvalRenderer.cpp
@@ -139,10 +139,10 @@ public:
 
             if (args.fDistanceVectorName) {
                 fragBuilder->codeAppend ("if (d == 0.0) {"); // if on the center of the circle
-                fragBuilder->codeAppendf("    %s = vec2(distanceToEdge, 0.0);", // avoid normalizing
+                fragBuilder->codeAppendf("    %s = vec3(1.0, 0.0, distanceToEdge);", // no normalize
                                          args.fDistanceVectorName);
                 fragBuilder->codeAppend ("} else {");
-                fragBuilder->codeAppendf("    %s = normalize(%s.xy) * distanceToEdge;",
+                fragBuilder->codeAppendf("    %s = vec3(normalize(%s.xy), distanceToEdge);",
                                          args.fDistanceVectorName, v.fsIn());
                 fragBuilder->codeAppend ("}");
             }