The app-facing classes in the webview support library should be very similar to the ones in the existing android.webkit package. So we should be able to essnetially copy most of the app-facing classes/interfaces from android.webkit into the webview support library.

There are some exceptions - probably only the classes which have implementations in android.webkit (rather than in the WebView APK), e.g. WebView.java where we will have to convert objects being passed to the WebView to InvocationHandlers before passing them on to our WebViewProvider.