Proposed fix for small bug in gpu conical gradients

src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp

Index: src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp
diff --git a/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp b/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp
index 720dc6345d5014cf3da0a4c9d66bfd386fbd14d0..3ab086119280fbc97cfa70fae398759bdeaa3212 100644
--- a/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp
+++ b/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp
@@ -785,7 +785,7 @@ static ConicalType set_matrix_circle_conical(const SkTwoPointConicalGradient& sh
     // to the edge shader. kEdgeErrorTol = 5 * kErrorTol was picked after manual testing
     // so that C = 1 / A is stable, and the linear approximation used in the Edge shader is
     // still accurate.
-    if (SkScalarAbs(A) < kEdgeErrorTol) {
+    if (SkScalarAbs(centerEndTrans.length() - (radiusEnd - 1)) < kEdgeErrorTol) {
         return kEdge_ConicalType;
     }