message: Built shared elements intersection array
  Animate the matching shared elements that exist in current and old state
diff: @@ -28,6 +28,22 @@ class SharedElementMotion extends React.Component {
  return {sharedElements};
  });
  }
  + getSharedElements() {
  + var {currentUrl, oldUrl} = this.getStateNavigator().stateContext;
  + var {sharedElements} = this.state;
  + var activeSharedElements = [];
  + if (url !== currentUrl) {
  + for(var name in sharedElements[url]) {
  + if ((sharedElements[oldUr] || {})[name]) {
  + activeSharedElements.push({
  + from: sharedElements[oldUrl][name],
  + to: sharedElements[url][name]
  + })
  + }
  + }
  + }
  + return activeSharedElements;
  + }
  render() {
  return null;
  }
  