Set up rewriting triggers

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index 006644705ac0cf8d3c5a4928eba6eecf4ac210d9..59100f1ae96869283ea632512c8120e1e3d8b4a8 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -932,6 +932,16 @@ class PreParserTraits {
   void SetFunctionNameFromIdentifierRef(PreParserExpression,
                                         PreParserExpression) {}
 
+  inline PreParserExpression RewriteNonPattern(
+      PreParserExpression expr, const ExpressionClassifier* classifier,
+      bool* ok);
+  inline PreParserExpression RewriteNonPatternArguments(
+      PreParserExpression args, const ExpressionClassifier* classifier,
+      bool* ok);
+  inline PreParserExpression RewriteNonPatternObjectLiteralProperty(
+      PreParserExpression property, const ExpressionClassifier* classifier,
+      bool* ok);
+
  private:
   PreParser* pre_parser_;
 };
@@ -1113,6 +1123,30 @@ PreParserExpression PreParserTraits::ParseDoExpression(bool* ok) {
 }
 
 
+PreParserExpression PreParserTraits::RewriteNonPattern(
+    PreParserExpression expr, const ExpressionClassifier* classifier,
+    bool* ok) {
+  pre_parser_->ValidateExpression(classifier, ok);
+  return expr;
+}
+
+
+PreParserExpression PreParserTraits::RewriteNonPatternArguments(
+    PreParserExpression args, const ExpressionClassifier* classifier,
+    bool* ok) {
+  pre_parser_->ValidateExpression(classifier, ok);
+  return args;
+}
+
+
+PreParserExpression PreParserTraits::RewriteNonPatternObjectLiteralProperty(
+    PreParserExpression property, const ExpressionClassifier* classifier,
+    bool* ok) {
+  pre_parser_->ValidateExpression(classifier, ok);
+  return property;
+}
+
+
 PreParserStatementList PreParser::ParseEagerFunctionBody(
     PreParserIdentifier function_name, int pos,
     const PreParserFormalParameters& parameters, FunctionKind kind,