Class fields, part 1 (parsing and infrastructure)

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index 1b4ab081b300a8e1bab473db96b76c76af74cdd3..7e50a19bab98769ff7fbe25893f4c495fc2529e7 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -311,6 +311,8 @@ class PreParserExpression {
   int position() const { return kNoSourcePosition; }
   void set_function_token_position(int position) {}
 
+  void set_is_class_field_initializer(bool is_class_field_initializer) {}
+
  private:
   enum Type {
     kEmpty,
@@ -465,6 +467,9 @@ class PreParserFactory {
                                        int pos) {
     return PreParserExpression::Default();
   }
+  PreParserExpression NewUndefinedLiteral(int pos) {
+    return PreParserExpression::Default();
+  }
   PreParserExpression NewRegExpLiteral(PreParserIdentifier js_pattern,
                                        int js_flags, int literal_index,
                                        int pos) {