Handle metadata with type literals or qualified identifiers.

runtime/vm/parser.h

Index: runtime/vm/parser.h
diff --git a/runtime/vm/parser.h b/runtime/vm/parser.h
index 60b02be361ae598045730ca37ee6aa766b7d2df9..7df910644d8121549966c73fd5837fe4aad896fe 100644
--- a/runtime/vm/parser.h
+++ b/runtime/vm/parser.h
@@ -556,6 +556,7 @@ class Parser : public ValueObject {
   AstNode* ParseUnaryExpr();
   AstNode* ParsePostfixExpr();
   AstNode* ParseSelectors(AstNode* primary, bool is_cascade);
+  AstNode* ParseQualified(AstNode* primary);
   AstNode* ParseCascades(AstNode* expr);
   AstNode* ParsePrimary();
   AstNode* ParseStringLiteral(bool allow_interpolation);