Generate hashcode on the java types.

editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/OverrideMember.java

Index: editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/OverrideMember.java
diff --git a/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/OverrideMember.java b/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/OverrideMember.java
index cb3642afe7366093070cc274d882febc0ecc8885..8adf9fef5b7c2e7506c203f331b88a623e7d6f5f 100644
--- a/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/OverrideMember.java
+++ b/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/OverrideMember.java
@@ -26,6 +26,7 @@ import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonPrimitive;
+import org.apache.commons.lang3.builder.HashCodeBuilder;
 import java.util.ArrayList;
 import java.util.Iterator;
 import org.apache.commons.lang3.StringUtils;
@@ -139,6 +140,16 @@ public class OverrideMember {
     return superclassMember;
   }
 
+  @Override
+  public int hashCode() {
+    HashCodeBuilder builder = new HashCodeBuilder();
+    builder.append(offset);
+    builder.append(length);
+    builder.append(superclassMember);
+    builder.append(interfaceMembers);
+    return builder.toHashCode();
+  }
+
   public JsonObject toJson() {
     JsonObject jsonObject = new JsonObject();
     jsonObject.addProperty("offset", offset);