Issue 5255. Remember 'overridden' for getters/setters and fields

compiler/java/com/google/dart/compiler/resolver/FieldElementImplementation.java

Index: compiler/java/com/google/dart/compiler/resolver/FieldElementImplementation.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/FieldElementImplementation.java b/compiler/java/com/google/dart/compiler/resolver/FieldElementImplementation.java
index 4ec338c3d409d0def21820e8f21618d1875bca88..d60a14425044f87c2049b4cc99fc587f1cebc363 100644
--- a/compiler/java/com/google/dart/compiler/resolver/FieldElementImplementation.java
+++ b/compiler/java/com/google/dart/compiler/resolver/FieldElementImplementation.java
@@ -4,6 +4,7 @@
 
 package com.google.dart.compiler.resolver;
 
+import com.google.common.collect.ImmutableSet;
 import com.google.dart.compiler.ast.DartField;
 import com.google.dart.compiler.ast.DartNode;
 import com.google.dart.compiler.ast.DartObsoleteMetadata;
@@ -11,6 +12,8 @@ import com.google.dart.compiler.ast.Modifiers;
 import com.google.dart.compiler.common.SourceInfo;
 import com.google.dart.compiler.type.Type;
 
+import java.util.Set;
+
 class FieldElementImplementation extends AbstractNodeElement implements FieldElement, FieldNodeElement {
   private final EnclosingElement holder;
   private final SourceInfo nameLocation;
@@ -20,6 +23,7 @@ class FieldElementImplementation extends AbstractNodeElement implements FieldEle
   private MethodNodeElement getter;
   private MethodNodeElement setter;
   private Type constantType;
+  private Set<Element> overridden = ImmutableSet.of();
 
   FieldElementImplementation(DartNode node,
       SourceInfo nameLocation,
@@ -113,4 +117,12 @@ class FieldElementImplementation extends AbstractNodeElement implements FieldEle
   public void setConstantType(Type type) {
     constantType = type;
   }
+
+  public void setOverridden(Set<Element> overridden) {
+    this.overridden = overridden;
+  }
+  
+  public Set<Element> getOverridden() {
+    return overridden;
+  }
 }