Steps to Reproduce

Edit: this issue appears to only manifest in our add-to-app use case. I'm not sure which layers of our add-to-app construction are specifically related to the problem.

1. Create a simple flutter app that uses the WebView plugin to render a page that is long enough to scroll.
2. Make sure to use the non-hybrid version of the plugin (not SurfaceAndroidWebView)
3. Run the app on Android (emulator should be fine) and scroll the page

Expected results:

Scroll bar should be rendered on the right side in LTR locales.

Actual results:

Scroll bar is rendered on the left side no matter the locale.