Scanner/parser support for DEP 9 (null-aware operators).

pkg/analyzer/lib/src/generated/testing/ast_factory.dart

Index: pkg/analyzer/lib/src/generated/testing/ast_factory.dart
diff --git a/pkg/analyzer/lib/src/generated/testing/ast_factory.dart b/pkg/analyzer/lib/src/generated/testing/ast_factory.dart
index fa46781290af1d1a0565a7a243680cd2349f5bad..0393bb6287058a78a2de8779291ae99c1fbf2170 100644
--- a/pkg/analyzer/lib/src/generated/testing/ast_factory.dart
+++ b/pkg/analyzer/lib/src/generated/testing/ast_factory.dart
@@ -696,9 +696,9 @@ class AstFactory {
       Expression target, SimpleIdentifier propertyName) => new PropertyAccess(
       target, TokenFactory.tokenFromType(TokenType.PERIOD), propertyName);
 
-  static PropertyAccess propertyAccess2(
-      Expression target, String propertyName) => new PropertyAccess(target,
-      TokenFactory.tokenFromType(TokenType.PERIOD), identifier3(propertyName));
+  static PropertyAccess propertyAccess2(Expression target, String propertyName,
+      [TokenType operator = TokenType.PERIOD]) => new PropertyAccess(
+      target, TokenFactory.tokenFromType(operator), identifier3(propertyName));
 
   static RedirectingConstructorInvocation redirectingConstructorInvocation(
           [List<Expression> arguments]) =>