xster 6d47092772 Split CupertinoScaffold into CupertinoTabScaffold and CupertinoPageScaffold (#12106)
* Refactor CupertinoScaffold

* Rename rootTabPageBuilder to tabBuilder

* fix tab transparency padding

* Add default background color

* review notes

* fix test
2017-09-20 17:58:53 -07:00
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