tree d3cf503e72f633e7c6ef51792bec077434deede6
parent ab62870c7e787323057d3b16a3ff1fd118fb5925
author Jeff Sharkey <jsharkey@android.com> 1379048346 -0700
committer Jeff Sharkey <jsharkey@android.com> 1379097304 -0700

Move search to roots; Documents root; hide empty.

Documents searches now happen root-wide, instead of only under a
subdirectory.  Updates abstract class and flags to match.  Add flag
for a root to indicate it's empty, and hide empty roots in UI unless
creating.

Define "Documents" public directory and storage backend to contain
files.

Bug: 10712057, 10710865, 10710758
Change-Id: I8716367568969f9cb1d83927b2bf5a7013809350