calls navigationcontroller #cangoback on ui thread . concode_field_sep long WAIT_TIMEOUT_SECONDS concode_field_sep void clearHistoryOnUiThread concode_elem_sep boolean canGoForwardOnUiThread concode_elem_sep String getUrlOnUiThread concode_elem_sep boolean canGoToOffsetOnUiThread concode_elem_sep void goBackSync concode_elem_sep void goForwardSync
boolean function ( Instrumentation arg0 , final WebContents arg1 ) { return InstrumentationUtils . runOnMainSyncAndGetResult ( arg0 , new Callable < Boolean > ( ) { @ Override public Boolean call ( ) { return arg1 . getNavigationController ( ) . canGoBack ( ) ; } } ) ; }