Tests trace events for dom stats.
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Tracing complete
First DOM stats
Object: {
	args: {
		data: {
			frame: string
			maxChildren: {
				nodeId: number
				nodeName: DIV id='parent'
				numChildren: 2
			}
			maxDepth: {
				depth: 3
				nodeId: number
				nodeName: DIV class='empty'
			}
			totalElements: 5
		}
	}
	cat: string
	name: string
	ph: string
	pid: number
	s: string
	tid: number
	ts: number
}
Last DOM stats
Object: {
	args: {
		data: {
			frame: string
			maxChildren: {
				nodeId: number
				nodeName: DIV id='parent'
				numChildren: 52
			}
			maxDepth: {
				depth: 5
				nodeId: number
				nodeName: DIV id='shadow-leaf'
			}
			totalElements: 57
		}
	}
	cat: string
	name: string
	ph: string
	pid: number
	s: string
	tid: number
	ts: number
}
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DOM stats with empty body element
Object: {
	args: {
		data: {
			frame: string
			maxChildren: {
				nodeId: number
				nodeName: HTML
				numChildren: 1
			}
			maxDepth: {
				depth: 1
				nodeId: number
				nodeName: BODY
			}
			totalElements: 2
		}
	}
	cat: string
	name: string
	ph: string
	pid: number
	s: string
	tid: number
	ts: number
}
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DOM stats with no body element
Object: {
	args: {
		data: {
			frame: string
			maxChildren: {
				nodeId: number
				nodeName: HTML
				numChildren: 0
			}
			maxDepth: {
				depth: 0
				nodeId: number
				nodeName: HTML
			}
			totalElements: 1
		}
	}
	cat: string
	name: string
	ph: string
	pid: number
	s: string
	tid: number
	ts: number
}
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Tracing complete
DOM stats with no document element
Object: {
	args: {
		data: {
			frame: string
			totalElements: 0
		}
	}
	cat: string
	name: string
	ph: string
	pid: number
	s: string
	tid: number
	ts: number
}