Internal Framework changes needed by DocumentUI's ScopedAccessProvider:

- Changed AM.getGrantedUriPermissions() API.
- Made DocumentsContract.PATH_TREE public.

Also fixed related AM methods to use explicit for on some loops.

Bug: 63720392
Test: manual verification

Change-Id: I33bdcb949f4301534bd8467c8018d6f03b4588a4
7 files changed