Shared OBB storage across users.

To avoid downloading large OBB files separately for each user,
provide a shared view of /sdcard/Android/obb to all apps.  Added
upgrade step to migrate the owners existing OBB files to become
the default view.

Bug: 7008879
Change-Id: I199321552fa7d4b97d5ed7fc3b3bc41f23618601
diff --git a/cmds/installd/installd.h b/cmds/installd/installd.h
index 3201427..5b81d2c 100644
--- a/cmds/installd/installd.h
+++ b/cmds/installd/installd.h
@@ -32,6 +32,7 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 
+#include <cutils/fs.h>
 #include <cutils/sockets.h>
 #include <cutils/log.h>
 #include <cutils/properties.h>