Generate hashcode on the java types.

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

Index: editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/HoverInformation.java
diff --git a/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/HoverInformation.java b/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/HoverInformation.java
index 0858a1b599ea542c02cf2d678df77db884416a6f..a9412eafa27a22bf183140f7fc6e604c0de4d080 100644
--- a/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/HoverInformation.java
+++ b/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/HoverInformation.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;
@@ -245,6 +246,22 @@ public class HoverInformation {
     return staticType;
   }
 
+  @Override
+  public int hashCode() {
+    HashCodeBuilder builder = new HashCodeBuilder();
+    builder.append(offset);
+    builder.append(length);
+    builder.append(containingLibraryPath);
+    builder.append(containingLibraryName);
+    builder.append(dartdoc);
+    builder.append(elementDescription);
+    builder.append(elementKind);
+    builder.append(parameter);
+    builder.append(propagatedType);
+    builder.append(staticType);
+    return builder.toHashCode();
+  }
+
   public JsonObject toJson() {
     JsonObject jsonObject = new JsonObject();
     jsonObject.addProperty("offset", offset);