We missed this because Flow wasn't being run properly on Travis but now that it is, it's clear that #7716 introduced a bunch of new Flow failures. Most of these shouldn't be too bad and I like to say "you break it you buy it" so this one is for you @Aweary :)

There were a couple other pre-existing Flow issues that @vjeux is going to fix, so mostly this should just be the TestRenderer issues.

ReactDOMInput.mountWrapper(this, props, hostParent);
        props = ReactDOMInput.getHostProps(this, props);
        transaction.getReactMountReady().enqueue(trackInputValue, this);
        transaction.getReactMountReady().enqueue(trapBubbledEventsLocal, this);
        break;
      case 'option':
        ReactDOMOption.mountWrapper(this, props, hostParent);
        props = ReactDOMOption.getHostProps(this, props);
        break;
      case 'select':
        ReactDOMSelect.mountWrapper(this, props, hostParent);
        props = ReactDOMSelect.getHostProps(this, props);
        transaction.getReactMountReady().enqueue(trapBubbledEventsLocal, this);
        break;
      case 'textarea':
        ReactDOMTextarea.mountWrapper(this, props, hostParent);
        props = ReactDOMTextarea.getHostProps(this, props);
        transaction.getReactMountReady().enqueue(trackInputValue, this);
        transaction.getReactMountReady().enqueue(trapBubbledEventsLocal, this);
        break;
    }
    assertValidProps(this, props);
    
    
    var namespaceURI;
    var parentTag;
    if (hostParent != null) {
      namespaceURI = hostParent._namespaceURI;
      parentTag = hostParent._tag;
    } else if (hostContainerInfo._tag) {