* ExtendedValues' "name" and "value" columns are exposed in Entry
entity subvalues, but it is clumsy to change a value, as the _id
of the ExtendedValues row isn't also exposed. (We otherwise have to
perform a potentially slow query)
* This CL adds the _id column to the columns exposed
Bug: 2638762
Change-Id: Iaffeffed620af78439f5f73aa5f3257b0f8a0fd0