Just for reference, there's a *lot* of dependencies that would need fixing to support OOPIFs inside a webview, beyond this.  We haven't started to track them yet, and as far as I'm aware, there aren't immediate plans to add that support.  It'd be nice to add it "some day," though.

For example, <webview> doesn't support cross-process navigations in its main frame today, given the chrome-guest:// approach that we use for the SiteInstance site URL.  We would have to change how SiteInstances work for guests to support any type of multi-process model inside webviews.

This was mainly filed to track an instance and leave a todo in https://codereview.chromium.org/1934703002/

Sounds good, thanks.  Comment 1 is mainly for the record, in case anyone is tempted to fix this.  :)

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Working on issue 734722 would probably get us most of the way there.