Ben Kwa 862b9641e3 Re-enable sorting in the DirectoryFragment.
- Move sorting from the back-end (using SortingCursorWrapper) to the the
  front-end (in DocumentsAdapter).  This makes it such that re-sorting
  the directory contents doesn't necessitate a reload.
- Update DirectoryLoaders to just return unsorted results, and rely on
  the UI to sort them.
- Remove the (now-unused) SortingCursorWrapper.
- Update Model tests to test sorting.

BUG=26024369

Change-Id: I871cc0e496267d381ae546e0309125d04649415a
2015-12-16 13:54:01 -08:00
2015-12-09 11:20:32 -08:00
2015-12-11 14:55:22 -08:00
2015-11-23 23:16:04 +00:00
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