IDL: Basic dictionary inheritance support

Source/core/testing/DictionaryTest.h

Index: Source/core/testing/DictionaryTest.h
diff --git a/Source/core/testing/DictionaryTest.h b/Source/core/testing/DictionaryTest.h
index f399dda0c2a184ee16bd3dccca6efc042b76a20d..66a0bf67737278596a7d819d6666cc18fde53cfb 100644
--- a/Source/core/testing/DictionaryTest.h
+++ b/Source/core/testing/DictionaryTest.h
@@ -15,6 +15,7 @@
 namespace blink {
 
 class InternalDictionary;
+class InternalDictionaryDerived;
 
 class DictionaryTest : public GarbageCollectedFinalized<DictionaryTest>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
@@ -30,6 +31,9 @@ public:
     // Sets each member of the given TestDictionary from fields
     void get(InternalDictionary&);
 
+    void setDerived(const InternalDictionaryDerived&);
+    void getDerived(InternalDictionaryDerived&);
+
     void trace(Visitor*);
 
 private:
@@ -59,6 +63,8 @@ private:
     RefPtrWillBeMember<Element> m_elementOrNullMember;
     ScriptValue m_objectMember;
     ScriptValue m_objectOrNullMemberWithDefault;
+    String m_derivedStringMember;
+    String m_derivedStringMemberWithDefault;
 };
 
 } // namespace blink