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];
```

var actualHistory = ReactNativeOperationHistoryDevtool.getHistory();
    expect(actualHistory).toEqual(expectedHistory);
  }
  describe('mount', () => {
    it('gets recorded for native roots', () => {
      var node = document.createElement('div');
      ReactDOM.render(<div><p>Hi.</p></div>, node);
      var inst = ReactDOMComponentTree.getInstanceFromNode(node.firstChild);
      assertHistoryMatches([{
        instanceID: inst._debugID,
        type: 'mount',
        payload: ReactDOMFeatureFlags.useCreateElement ?
          'DIV' :
          '<div data-reactroot="" data-reactid="1"><p data-reactid="2">Hi.</p></div>',
      }]);
    });
    it('gets recorded for composite roots', () => {
      function Foo() {