content/network's URLLoader needs to implement OnCertificateRequested. Luckily that interface is already asynchronous. It'll have to IPC to the browser and go through the same code path that ResourceLoader::OnCertificateRequested currently does. As an example, see r513989 which did this for OnSSLCertificateError.
This will fix the following browser_tests:
PrerenderBrowserTest.PrerenderSSLClientCertIframe
PrerenderBrowserTest.PrerenderSSLClientCertSubresource
PrerenderBrowserTest.PrerenderSSLClientCertTopLevel
SSLUITestWithClientCert.TestWSSClientCert
Comment 1 by juncai@chromium.org
, Dec 5 2017Status: Assigned (was: Available)