question: public static long installAge ( long currentTimestamp , long installTimestamp , boolean sendInstallEvent ) { if ( sendInstallEvent ) { return INSTALL_AGE_IMMEDIATELY_AFTER_INSTALLING ; } else { return Math . max ( 0L , ( currentTimestamp - installTimestamp ) / MS_PER_DAY ) ; } }
target:  Determine how long it's been since Chrome was first installed.  Note that this may not accurate for various reasons, but it shouldn't affect stats too much.