Consistently name hook functions onHookName

Change-Id: I94414e43f14d37e53721fd397112732286c67037
Prioritize updates triggered by revision deletion

Change-Id: I06b0084ea6044d84ee372e13959a2fe7a163c9dd
Merge "Consistently name hook functions onHookName"
Merge "Prioritize updates triggered by revision deletion"