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];
```

break;
        case ReactMultiChildUpdateTypes.TEXT_CONTENT:
          setTextContent(
            parentNode,
            update.content
          );
          if (__DEV__) {
            ReactInstrumentation.debugTool.onNativeOperation(
              parentNodeDebugID,
              'replace text',
              update.content.toString()
            );
          }
          break;
        case ReactMultiChildUpdateTypes.REMOVE_NODE:
          removeChild(parentNode, update.fromNode);
          if (__DEV__) {
            ReactInstrumentation.debugTool.onNativeOperation(
              parentNodeDebugID,
              'remove child',
              {fromIndex: update.fromIndex}
            );
          }
          break;
      }
    }
  },
};
module.exports = DOMChildrenOperations;