Right now (around the time of the branch point for 66) the chromium-side of the support library is somewhat implemented but not entirely - so using the current ToT WebView will most likely break the WebView Support Library.
We should make sure WebView 66 does not break the support library.
I think the easiest way to do this is to remove (only in 66) the entry-point for the support library into chromium code, then 66 should be treated like all other WebView versions that are not compatible with the support library.
Comment 1 by bugdroid1@chromium.org
, Mar 8 2018