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];
```

}} />, node);
      var inst = ReactDOMComponentTree.getInstanceFromNode(node.firstChild);
      if (ReactDOMFeatureFlags.useCreateElement) {
        assertHistoryMatches([{
          instanceID: inst._debugID,
          type: 'update styles',
          payload: {
            color: 'red',
            backgroundColor: 'yellow',
          },
        }, {
          instanceID: inst._debugID,
          type: 'mount',
          payload: 'DIV',
        }]);
      } else {
        assertHistoryMatches([{
          instanceID: inst._debugID,
          type: 'mount',
          payload: '<div style="color:red;background-color:yellow;" ' +
          'data-reactroot="" data-reactid="1"></div>',
        }]);
      }
    });
    it('gets recorded during an update', () => {
      var node = document.createElement('div');
      ReactDOM.render(<div />, node);
      var inst = ReactDOMComponentTree.getInstanceFromNode(node.firstChild);
      ReactNativeOperationHistoryDevtool.clearHistory();
      ReactDOM.render(<div style={{ color: 'red' }} />, node);