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];
```

payload: { tabIndex: 43 },
        }]);
      });
    });
  });
  describe('replace text', () => {
    describe('text content', () => {
      it('gets recorded during an update from text content', () => {
        var node = document.createElement('div');
        ReactDOM.render(<div>Hi.</div>, node);
        var inst = ReactDOMComponentTree.getInstanceFromNode(node.firstChild);
        ReactNativeOperationHistoryDevtool.clearHistory();
        ReactDOM.render(<div>Bye.</div>, node);
        assertHistoryMatches([{
          instanceID: inst._debugID,
          type: 'replace text',
          payload: 'Bye.',
        }]);
      });
      it('gets recorded during an update from html', () => {
        var node = document.createElement('div');
        ReactDOM.render(<div dangerouslySetInnerHTML={{__html: 'Hi.'}} />, node);
        var inst = ReactDOMComponentTree.getInstanceFromNode(node.firstChild);
        ReactNativeOperationHistoryDevtool.clearHistory();
        ReactDOM.render(<div>Bye.</div>, node);
        assertHistoryMatches([{
          instanceID: inst._debugID,
          type: 'replace text',
          payload: 'Bye.',
        }]);