IDL: Basic dictionary inheritance support

Source/core/testing/DictionaryTest.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DictionaryTest_h
 #define DictionaryTest_h
 
 #include "bindings/core/v8/Nullable.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/Element.h"
 #include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class InternalDictionary;
+class InternalDictionaryDerived;
 
 class DictionaryTest : public GarbageCollectedFinalized<DictionaryTest>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static DictionaryTest* create()
     {
         return new DictionaryTest();
     }
     virtual ~DictionaryTest();
 
     // Stores all members into corresponding fields
     void set(const InternalDictionary&);
     // Sets each member of the given TestDictionary from fields
     void get(InternalDictionary&);
 
+    void setDerived(const InternalDictionaryDerived&);
+    void getDerived(InternalDictionaryDerived&);
+
     void trace(Visitor*);
 
 private:
     DictionaryTest();
 
     void reset();
 
     // The reason to use Nullable<T> is convenience; we use Nullable<T> here to
     // record whether the member field is set or not. Some members are not
     // wrapped with Nullable because:
     //  - |longMemberWithDefault| has a non-null default value
     //  - String and PtrTypes can express whether they are null
     Nullable<int> m_longMember;
     int m_longMemberWithDefault;
     Nullable<int> m_longOrNullMember;
     Nullable<int> m_longOrNullMemberWithDefault;
     Nullable<bool> m_booleanMember;
     Nullable<double> m_doubleMember;
     String m_stringMember;
     String m_stringMemberWithDefault;
     Nullable<Vector<String> > m_stringSequenceMember;
     Nullable<Vector<String> > m_stringSequenceOrNullMember;
     String m_enumMember;
     String m_enumMemberWithDefault;
     String m_enumOrNullMember;
     RefPtrWillBeMember<Element> m_elementMember;
     RefPtrWillBeMember<Element> m_elementOrNullMember;
     ScriptValue m_objectMember;
     ScriptValue m_objectOrNullMemberWithDefault;
+    String m_derivedStringMember;
+    String m_derivedStringMemberWithDefault;
 };
 
 } // namespace blink
 
 #endif // DictionaryTest_h