question: adds a listener . concode_field_sep String SIGNED_IN_ACCOUNT_KEY concode_elem_sep Object LOCK concode_elem_sep Context mApplicationContext concode_elem_sep String TAG concode_elem_sep ChromeSigninController sChromeSigninController concode_elem_sep ObserverList<Listener> mListeners concode_field_sep void onClearSignedInUser concode_elem_sep void setSignedInAccountName concode_elem_sep String getSignedInAccountName concode_elem_sep boolean isSignedIn concode_elem_sep ChromeSigninController get concode_elem_sep void removeListener concode_elem_sep void clearSignedInUser concode_elem_sep Account getSignedInUser
target: void function ( Listener arg0 ) { mListeners . addObserver ( arg0 ) ; }