Tests certain trace events in iframes.
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Frames:
  url: inspector-protocol/resources/inspector-protocol-page.html name:  parentUrl: -
  url: data:text/html,<script>window.foo = 42</script> name: frame0 parentUrl: inspector-protocol/resources/inspector-protocol-page.html
  url: about:blank name: Frame No. 1 parentUrl: inspector-protocol/resources/inspector-protocol-page.html
  url: inspector-protocol/resources/blank.html name:  parentUrl: inspector-protocol/resources/inspector-protocol-page.html