Tests renderer: frame load events.
FRAME A 1
IFRAME 1
Frames: 4
 frameId=MainFrame
  url=http://example.com/1
 frameId=<string>
  url=http://example.com/frameA/
  url=http://example.com/frameA/1
 frameId=<string>
  url=http://example.com/frameB/
  url=http://example.com/frameB/1
 frameId=<string>
  url=http://example.com/frameB/1/iframe/
  url=http://example.com/frameB/1/iframe/1
ScheduledNavigations: 3
 frameId=<string>
  url=http://example.com/frameA/1 reason=scriptInitiated
 frameId=<string>
  url=http://example.com/frameB/1 reason=scriptInitiated
 frameId=<string>
  url=http://example.com/frameB/1/iframe/1 reason=scriptInitiated
Expected requested urls:
 http://example.com/
 http://example.com/1
 http://example.com/frameA/
 http://example.com/frameA/1
 http://example.com/frameB/
 http://example.com/frameB/1
 http://example.com/frameB/1/iframe/
 http://example.com/frameB/1/iframe/1