Tests sending of info for iframe with src which is being written to after a delay
Frame navigated to http://devtools.test:8000/inspector-protocol/page/resources/iframe-src.html
Frame navigated to http://devtools.test:8000/inspector-protocol/resources/empty.html
Document opened, new url: http://devtools.test:8000/inspector-protocol/page/resources/iframe-src.html
Received information about 2 frame(s).