textproc/opensearch-dashboards: Add CHROME option

Chrome is required for generating reports.  Add an option to make this
more visible, but since the dependencies are large, do not enable it by
default.

PORTREVISION is kept unchanged since the default package is not
modified.

With hat:	opensearch

textproc/opensearch-dashboards/Makefile

@@ -15,6 +15,11 @@ BUILD_DEPENDS=	npm-node14>0:www/npm-node14
 USES=		nodejs:14,build,run python:build
 USE_RC_SUBR=	${PORTNAME}
 
+OPTIONS_DEFINE=	CHROME
+
+CHROME_DESC=	Add dependency on www/chromium (required for PDF reports)
+CHROME_RUN_DEPENDS=chrome:www/chromium
+
 _DEVDIR=	${WRKDIR}/.devdir
 
 post-patch: