New 'Clean Up' to convert old optional parameters to the new optional named where possible.

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

Index: compiler/java/com/google/dart/compiler/ast/DartFunction.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartFunction.java b/compiler/java/com/google/dart/compiler/ast/DartFunction.java
index 2161859cb633d80210f1ad9a26ac2ae1e3457bfe..09e644a9af280bd0acaece32fc457a1b6635b3d3 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartFunction.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartFunction.java
@@ -12,11 +12,17 @@ import java.util.List;
 public class DartFunction extends DartNode {
 
   private final NodeList<DartParameter> parameters = NodeList.create(this);
+  private final int parametersOptionalOpen;
+  private final int parametersOptionalClose;
   private final int parametersCloseParen;
   private DartBlock body;
   private DartTypeNode returnTypeNode;
 
-  public DartFunction(List<DartParameter> parameters, int parametersCloseParen, DartBlock body, DartTypeNode returnTypeNode) {
+  public DartFunction(List<DartParameter> parameters, int parametersOptionalOpen,
+      int parametersOptionalClose, int parametersCloseParen, DartBlock body,
+      DartTypeNode returnTypeNode) {
+    this.parametersOptionalOpen = parametersOptionalOpen;
+    this.parametersOptionalClose = parametersOptionalClose;
     this.parameters.addAll(parameters);
     this.parametersCloseParen = parametersCloseParen;
     this.body = becomeParentOf(body);
@@ -30,6 +36,14 @@ public class DartFunction extends DartNode {
   public List<DartParameter> getParameters() {
     return parameters;
   }
+
+  public int getParametersOptionalOpen() {
+    return parametersOptionalOpen;
+  }
+
+  public int getParametersOptionalClose() {
+    return parametersOptionalClose;
+  }
   
   public int getParametersCloseParen() {
     return parametersCloseParen;