Root invalidation, write and grid flags, local.

Flags to indicate write support, and to indicate that a grid view is
preferred.  Method to inform system that any root caches should be
invalidated.  Methods to mark a Uri as requesting "local only" data.

Helper method for document creation.

Bug: 10330069, 10330108, 10330210, 10329976
Change-Id: I6ce6160f6ce6621e6ea05848a31bbbcb84587671