Fields to track how much visual voicemail quota is used.
Add field LAST_MODIFIED to VoicemailContract.Voicemails.
Add field LAST_MODIFIED to CallLog.Calls.
Timestamp field for the last time the row is inserted/updated.
+ VoicemailContract.Status.setQuota() helper method to set the quota.
Bug:25197644
Bug:22013880
Change-Id: Icb250203971df1f4ae4e1cbc9dbefeec9ad3282e