In a short unpublished case, the Ninth Circuit determined that California's definition of petty offense is categorically overbroad and indivisible as compared to the generic definition of a theft offense. As such, it can never be a theft aggravated felony, regardless of the sentence imposed.
The full text of Chavez v. Lynch can be found here: http://cdn.ca9.uscourts.gov/datastore/memoranda/2015/08/06/11-73977.pdf