Nicolas Charpentier a74d05be62 Add default render loading on Android WebView
Summary:I just noticed that Android WebView do not have a render loading default like iOS, so I added one.

**Test plan**

I used WebView without renderLoading on Android.

![image](https://cloud.githubusercontent.com/assets/7189823/14028408/bd94c83e-f1d2-11e5-8791-3372684b429e.png)
Closes https://github.com/facebook/react-native/pull/6635

Differential Revision: D3126416

Pulled By: andreicoman11

fb-gh-sync-id: 422966ba3dd6912cbcb0b540e26a3ec48c85daea
fbshipit-source-id: 422966ba3dd6912cbcb0b540e26a3ec48c85daea
2016-04-01 08:05:21 -07:00
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