tree c86d01f2f1aaf23edd5b4424388144670dad7cb2
parent ef7184a1aa0be5d496a5cb495a0f9e11f342af44
author Jeff Sharkey <jsharkey@android.com> 1375813570 -0700
committer Jeff Sharkey <jsharkey@android.com> 1375814326 -0700

Storage roots in fragment, sectioned.

Move storage roots into a fragment, since it's not a drawer on
tablets.  Cluster and sort roots when displaying.  SectionedListAdapter
to make clustered roots easier to manage.  Add docs for root types.

Move roots cache into separate class to make it easier to share.

Change-Id: Ia0b92eade059e816324641f600c08026c0e268c9