add clipping js code

lib/extract/extractClipping.js

@@ -0,0 +1,18 @@
+import SerializablePath from 'react-native/Libraries/ART/ARTSerializablePath';
+
+const clipRules = {
+    evenodd: 0,
+    nonzero: 1
+};
+
+export default function (props) {
+    let {clipPath, clipRule} = props;
+    let clippingProps = {};
+
+    if (clipPath) {
+        clippingProps.clipPath = new SerializablePath(clipPath).toJSON();
+        clippingProps.clipRule = clipRules[clipRule] === 0 ? 0 : 1;
+    }
+
+    return clippingProps;
+}