Fix a bug where msg contents were dropped in CSS in idom.
@@ -1761,6 +1761,7 @@ public final class GenIncrementalDomCodeVisitor extends GenJsCodeVisitor {
getJsCodeBuilder().addChunkToOutputVar(GOOG_STRING_UNESCAPE_ENTITIES.call(msgExpression));
break;
case HTML_RCDATA:
+ case CSS:
msgExpression = getAssistantForMsgs().generateMsgGroupVariable(node);
getJsCodeBuilder().append(INCREMENTAL_DOM_TEXT.call(id("String").call(msgExpression)));
break;
