Tests certain trace events in iframes.
Recording started
Tracing complete
Frames in TracingStartedInPage
url: inspector-protocol/resources/inspector-protocol-page.html name:  parent: undefined nodeId: undefined
url: about:blank name: frame0 parent: string nodeId: number
Frames in CommitLoad events
url: data:text/html,<script>window.foo = 42</script> name: frame0 parent: string nodeId: number
url: about:blank name: Frame No. 1 parent: string nodeId: number
url: inspector-protocol/resources/blank.html name:  parent: string nodeId: number

