California Governor Jerry Brown is making it official:  A Chinese automobile and battery manufacturer plans to build an electric bus factory in Lancaster.  The AV Press says the governor made the announcement after touring BYD headquarters in Shenzhen.  Brown is in the world's most populous nation to discuss cooperation on trade and investment as well as other matters.  BYD announced last month it was buying two properties in Lancaster to build ten electric buses for the Long Beach Transit agency.  The exact site of the plant will be made known publicly on May 1st.