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63343dad2e
Summary:
For props that expects a struct/object value, like scrollView's contentInset, not all keys may be present. For example:
```
<ScrollView ... contentInset={{top: 10}} />
```
In this example, `left`, `bottom`, and `right` should just default to 0 (or whatever the default is in the platform). Before this fix, an exception occured when calling `fromRawValue()` because it is assuming all 4 keys are present in the prop bag. However, only `top` key was present in this example.
To fix this, we have to loop through the available keys in the prop bag, then assign the values accordingly.
Reviewed By: JoshuaGross
Differential Revision: D14868549
fbshipit-source-id: e25208eb31f6d4061338e9cac48a93fe71859859