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The primary use case is to allow opening CWVWebView from WKWebView on window.open().
Background: https://docs.google.com/document/d/1IjJho7tGNp8azsA075VWBowrsi0m4lHAQarCvfF286I/edit#heading=h.bj843njsw7va
Design doc: https://docs.google.com/document/d/1cVySp7_L-kRqP2Q_R3YrS8d7XsbVqTjUbb7UhIMni0k/

Change-Id: I95753c511affaa91f355cf9e75d336933850d854
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864750Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Jiajun Ou <garzonou@google.com>
Auto-Submit: Jiajun Ou <garzonou@google.com>
Cr-Commit-Position: refs/heads/master@{#714423}