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];
```

findDOMNode(comp),
      fakeNativeEvent
    );
  },
  nativeTouchData: function(x, y) {
    return {
      touches: [
        {pageX: x, pageY: y},
      ],
    };
  },
  createRenderer: function() {
    return new ReactShallowRenderer();
  },
  Simulate: null,
  SimulateNative: {},
};
/**
 * @class ReactShallowRenderer
 */
var ReactShallowRenderer = function() {
  this._instance = null;
};
ReactShallowRenderer.prototype.getMountedInstance = function() {
  return this._instance ? this._instance._instance : null;
};
var NoopInternalComponent = function(element) {
  this._renderedOutput = element;
  this._currentElement = element;
};