IDL: Add build target for IDL dictionary impl generation in core

Source/core/testing/Internals.h

Index: Source/core/testing/Internals.h
diff --git a/Source/core/testing/Internals.h b/Source/core/testing/Internals.h
index a199a38a4d254f410ca140f0a0f66f5ca382b567..65be7d43fec5d48750471c288c0d152cfd19e007 100644
--- a/Source/core/testing/Internals.h
+++ b/Source/core/testing/Internals.h
@@ -48,6 +48,7 @@ class ClientRectList;
 class WebKitPoint;
 class DOMStringList;
 class LocalDOMWindow;
+class DictionaryTest;
 class Document;
 class DocumentMarker;
 class Element;
@@ -260,6 +261,7 @@ public:
 
     PassRefPtrWillBeRawPtr<TypeConversions> typeConversions() const;
     PrivateScriptTest* privateScriptTest() const;
+    DictionaryTest* dictionaryTest() const;
 
     Vector<String> getReferencedFilePaths() const;