title: Pass UIImage to RCTRootView
body: <p>I'm working on a hybrid ios native/react-native project.</p>
  
  <p>Let's say I have an instance of <code>UIImage</code> at some point in my app.
  I need to display this image in my react-native component. I create an <code>RCTRootView</code> like this:</p>
  
  <pre><code>  RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation
                                                    moduleName:@"SomeScreen"
                                             initialProperties:someParameters
                                                 launchOptions:launchOptions];
  </code></pre>
  
  <p>What do I do next?
  Facebook describes how to use the <code>&lt;Image&gt;</code> component with uri, addressing an image in local file system or in Web. But I don't want to download it twice (also I don't want to reimplement authentication in react-native). </p>
  
  <p>Is there any way to pass already existing <code>UIImage</code> to react-native component?</p>