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];
```

});
      
      expect(DOMPropertyOperations.createMarkupForProperty(
        'name',
        'simple'
      )).toBe('name="simple"');
      expect(DOMPropertyOperations.createMarkupForProperty(
        'data-name',
        'simple'
      )).toBe('data-name="simple"');
      
      expect(DOMPropertyOperations.createMarkupForProperty(
        'foobar',
        'simple'
      )).toBe('foobar="simple"');
      
      expect(DOMPropertyOperations.createMarkupForProperty(
        'foo-xyz',
        'simple'
      )).toBe('foo-xyz="simple"');
      
      expect(function() {
        DOMProperty.injection.injectDOMPropertyConfig(
          {Properties: {foobar: null}}
        );
      }).toThrow();
    });
  });
});