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(stubNode.hasAttribute('hidden')).toBe(false);
    });
    it('should remove property properly even with different name', function() {
      
      
      DOMProperty.injection.injectDOMPropertyConfig({
        Properties: {foobar: DOMProperty.injection.MUST_USE_PROPERTY},
        DOMPropertyNames: {
          foobar: 'className',
        },
        DOMAttributeNames: {
          foobar: 'class',
        },
      });
      DOMPropertyOperations.setValueForProperty(
        stubNode,
        'foobar',
        'selected'
      );
      expect(stubNode.className).toBe('selected');
      DOMPropertyOperations.setValueForProperty(
        stubNode,
        'foobar',
        null
      );
      
      
      expect(stubNode.className).toBe('');
    });