perf(theming): don't use $watch if register for change is available
perf(theming): don't use $watch if register for change is available

Register with parent theme controller for theme change if possible.

Closes #8995

Frank3K/material,vertazzar/material,pwistbac/material,bluebirdtech/material,graingert/material,SamDLT/material,david-gang/material,angular/material,vertazzar/material,profoundry-us/material,profoundry-us/material,pwistbac/material,Splaktar/material,Frank3K/material,j3ski/material,oostmeijer/material,bluebirdtech/material,graingert/material,pwistbac/material,Splaktar/material,j3ski/material,imjoeco/material,ServiceManagementGroup/material,crisbeto/material,welkinhealth/material,profoundry-us/material,oostmeijer/material,crisbeto/material,gkalpak/material,imjoeco/material,DevVersion/material,ServiceManagementGroup/material,ilovett/material,ilovett/material,miguelcobain/material,ServiceManagementGroup/material,bluebirdtech/material,miguelcobain/material,miguelcobain/material,SamDLT/material,ilovett/material,SamDLT/material,oostmeijer/material,clshortfuse/material,crisbeto/material,clshortfuse/material,imjoeco/material,hayloft/material,angular/material,bluebirdtech/material,crisbeto/material,daniel-nagy/material,j3ski/material,clshortfuse/material,hayloft/material,marekmicek/material,angular/material,hayloft/material,graingert/material,pwistbac/material,Frank3K/material,imjoeco/material,j3ski/material,welkinhealth/material,oostmeijer/material,gkalpak/material,daniel-nagy/material,angular/material,DevVersion/material,Splaktar/material,david-gang/material,Splaktar/material,DevVersion/material,graingert/material,marekmicek/material,miguelcobain/material,welkinhealth/material,hayloft/material,Frank3K/material,ServiceManagementGroup/material,gkalpak/material,clshortfuse/material,marekmicek/material,daniel-nagy/material,david-gang/material,daniel-nagy/material,vertazzar/material,SamDLT/material,gkalpak/material,david-gang/material,vertazzar/material,ilovett/material,profoundry-us/material,DevVersion/material,marekmicek/material,welkinhealth/material