Janic Duplessis 9a51fa8e15 Improve z-index implementation on Android
Summary:
Use `getChildDrawingOrder` instead of reordering views. The old implementation didn't work properly when `removeClippedSubviews` was enabled and this one should have better performance since we don't play with the view hierarchy at all.

This fixes weird bugs with sticky headers in `SectionList` and allows removing the hack that disabled `removeClippedSubviews` when using sticky section headers.

**Test plan**
Tested using the SectionList and ListViewPaging examples that use sticky headers which uses z-index.
Closes https://github.com/facebook/react-native/pull/13105

Reviewed By: sahrens

Differential Revision: D4765869

Pulled By: achen1

fbshipit-source-id: be3c824658a3ce965b6e7324ad95c77cbd8a86ae
2017-04-05 09:17:46 -07:00
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