Fix for issues 3729 and 3523

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

Index: compiler/java/com/google/dart/compiler/ast/DartMethodInvocation.java
===================================================================
--- compiler/java/com/google/dart/compiler/ast/DartMethodInvocation.java	(revision 9267)
+++ compiler/java/com/google/dart/compiler/ast/DartMethodInvocation.java	(working copy)
@@ -25,14 +25,17 @@
 public class DartMethodInvocation extends DartInvocation {
 
   private DartExpression target;
+  private boolean isCascade;
   private DartIdentifier functionName;
 
   public DartMethodInvocation(DartExpression target,
+      boolean isCascade,
       DartIdentifier functionName,
       List<DartExpression> args) {
     super(args);
     functionName.getClass(); // Quick null-check.
     this.target = becomeParentOf(target);
+    this.isCascade = isCascade;
     this.functionName = becomeParentOf(functionName);
   }
 
@@ -45,6 +48,10 @@
     return functionName.getName();
   }
 
+  public boolean isCascade() {
+    return isCascade;
+  }
+
   public DartIdentifier getFunctionName() {
     return functionName;
   }