Fix for issues 3729 and 3523

compiler/java/com/google/dart/compiler/ast/DartPropertyAccess.java

Index: compiler/java/com/google/dart/compiler/ast/DartPropertyAccess.java
===================================================================
--- compiler/java/com/google/dart/compiler/ast/DartPropertyAccess.java	(revision 9267)
+++ compiler/java/com/google/dart/compiler/ast/DartPropertyAccess.java	(working copy)
@@ -13,10 +13,16 @@
 public class DartPropertyAccess extends DartExpression {
 
   private DartNode qualifier;
+  private boolean isCascade;
   private DartIdentifier name;
 
   public DartPropertyAccess(DartNode qualifier, DartIdentifier name) {
+    this(qualifier, false, name);
+  }
+
+  public DartPropertyAccess(DartNode qualifier, boolean isCascade, DartIdentifier name) {
     this.qualifier = becomeParentOf(qualifier);
+    this.isCascade = isCascade;
     this.name = becomeParentOf(name);
   }
 
@@ -25,6 +31,10 @@
     return true;
   }
 
+  public boolean isCascade() {
+    return isCascade;
+  }
+
   public String getPropertyName() {
     return name.getName();
   }