I was testing latest refactor of PerfTools.
When using printOperations() often (but not always) I get 

```
Uncaught TypeError: Cannot read property 'displayName' of undefined
```

in getOperations() on the line:

```
var {displayName, ownerID} = treeSnapshot[instanceID];
```

}]);
    });
    it('gets ignored if new html is equal', () => {
      var node = document.createElement('div');
      ReactDOM.render(
        <div dangerouslySetInnerHTML={{__html: 'Hi.'}} />,
        node
      );
      ReactNativeOperationHistoryDevtool.clearHistory();
      ReactDOM.render(
        <div dangerouslySetInnerHTML={{__html: 'Hi.'}} />,
        node
      );
      assertHistoryMatches([]);
    });
  });
  describe('insert child', () => {
    it('gets reported when a child is inserted', () => {
      var node = document.createElement('div');
      ReactDOM.render(<div><span /></div>, node);
      var inst = ReactDOMComponentTree.getInstanceFromNode(node.firstChild);
      ReactNativeOperationHistoryDevtool.clearHistory();
      ReactDOM.render(<div><span /><p /></div>, node);
      assertHistoryMatches([{
        instanceID: inst._debugID,
        type: 'insert child',
        payload: {toIndex: 1, content: 'P'},
      }]);
    });
  });