Open source Android WebView

Summary:
Keep `WebView.android.js` and `WebView.ios.js`, there are
some small differences. Use the same example on both platforms.

public

Reviewed By: bestander

Differential Revision: D2769446

fb-gh-sync-id: be3d0afcbfd6ddcbaa49f70555063b3081ba03cb

Examples/UIExplorer/UIExplorerList.android.js

@@ -34,6 +34,7 @@ var COMPONENTS = [
   require('./TouchableExample'),
   require('./ViewExample'),
   require('./ViewPagerAndroidExample.android'),
+  require('./WebViewExample'),
 ];
 
 var APIS = [