Adds a new Ephemeral.WebContext that subclasses WebKit.WebContext to make setting properties easier. Enables process_swap_on_cross_site_navigation_enabled and set_sandbox_enabled on the WebContext to sandbox domains from one another and to sandbox WebKit subprocesses as well. Also updates the WebKit vapi.
Adds a new Ephemeral.WebContext that subclasses WebKit.WebContext to make setting properties easier. Enables
process_swap_on_cross_site_navigation_enabledandset_sandbox_enabledon the WebContext to sandbox domains from one another and to sandbox WebKit subprocesses as well. Also updates the WebKit vapi.Note that this suffers from this visual regression with navigation gestures: https://bugs.webkit.org/show_bug.cgi?id=205651