title: Add native view over Webview content
body: <p>Up to Android 26 I could addView on a WebView without any problem. 
  With the correct LayoutParam my content would act just like a web content. It would scroll with the webview etc...</p>
  
  <p>Since Android 27, the added content is displayed, but it does not scroll with the content, and I can't inspect the WebView view hierarchy anymore. 
  Also the WebView report a child count of 0. </p>
  
  <p>Anyone have some indication on this (private I understand) behaviour?</p>