Add flipped gradient branch to two point conical gradient

src/effects/gradients/SkGradientShaderPriv.h

Index: src/effects/gradients/SkGradientShaderPriv.h
diff --git a/src/effects/gradients/SkGradientShaderPriv.h b/src/effects/gradients/SkGradientShaderPriv.h
index 1d0f008917d42d974c393d3fb4c31dbd580d8572..f4f53dee25a4611d07b84176bce8def9436913c8 100644
--- a/src/effects/gradients/SkGradientShaderPriv.h
+++ b/src/effects/gradients/SkGradientShaderPriv.h
@@ -205,6 +205,11 @@ protected:
 
     void commonAsAGradient(GradientInfo*) const;
 
+    // V23_COMPATIBILITY_CODE
+    // Used for 2-pt conical gradients since we sort start/end cirlces by radius
+    // Assumes space has already been allocated for fOrigColors
+    void flipGradientColors();
+
 private:
     enum {
         kColorStorageCount = 4, // more than this many colors, and we'll use sk_malloc for the space