Picture element initial implementation

Source/core/html/HTMLPictureElement.h

Index: Source/core/html/HTMLPictureElement.h
diff --git a/Source/core/html/HTMLPictureElement.h b/Source/core/html/HTMLPictureElement.h
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+/*
+ * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
+ *           (C) 1999 Antti Koivisto (koivisto@kde.org)
+ * Copyright (C) 2004, 2008, 2010 Apple Inc. All rights reserved.
+ * Copyright (C) 2010 Google Inc. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef HTMLPictureElement_h
+#define HTMLPictureElement_h
+
+#include "HTMLImageElement.h"
+#include "HTMLSourceElement.h"
+
+namespace WebCore {
+
+class HTMLPictureElement : public HTMLImageElement {
+    HTMLPictureElement(const QualifiedName& tagName, Document* document)
+        : HTMLImageElement(tagName, document, 0),
+        m_hasSrc(false)
+    {
+        ASSERT(hasTagName(pictureTag));
+    }
+
+    ~HTMLPictureElement();
+    const AtomicString& imageSourceURL() const { return getMatchingSource()->getAttribute(HTMLNames::srcAttr); }
+    const Element* getMatchingSource() const;
+
+    virtual bool isPictureElement() const { return true; }
+    virtual void parseAttribute(const QualifiedName&, const AtomicString&);
+
+    bool m_hasSrc;
+
+public:
+    static PassRefPtr<HTMLPictureElement> create(Document*);
+
+    static PassRefPtr<HTMLPictureElement> create(const QualifiedName& tagName, Document*);
+    static PassRefPtr<HTMLPictureElement> createForJSConstructor(Document*, const int* optionalWidth, const int* optionalHeight);
+    void sourceWasAdded();
+
+};
+
+} // namespace
+
+#endif