Activity can be used only in two cases. 1) Calling uid matches uid grantee. 2) Calling uid is is system. This flow is used by getToken methods with notifyAuthFailure=true. Test: Existing CTS tests Bug: 158480899 Merged-In: I1421c333b6cebb4f7cddcdd8766298f6872e933b Change-Id: I18af48cf3cb4ad23a3e5b02a8ea1416aa5570dba