[SVG] Implement 'discard' element

Source/core/svg/SVGDiscardElement.cpp

Index: Source/core/svg/SVGDiscardElement.cpp
diff --git a/Source/core/svg/SVGDiscardElement.cpp b/Source/core/svg/SVGDiscardElement.cpp
new file mode 100755
index 0000000000000000000000000000000000000000..84034c1b61ecdaeee2114f7e8ae8802ff2d51700
--- /dev/null
+++ b/Source/core/svg/SVGDiscardElement.cpp
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2013 Samsung Electronics. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "core/svg/SVGDiscardElement.h"
+
+#include "SVGNames.h"
+
+namespace WebCore {
+
+SVGDiscardElement::SVGDiscardElement(Document& document)
+    : SVGSMILElement(SVGNames::discardTag, document)
+{
+    ScriptWrappable::init(this);
+}
+
+PassRefPtr<SVGDiscardElement> SVGDiscardElement::create(Document& document)
+{
+    return adoptRef(new SVGDiscardElement(document));
+}
+
+bool SVGDiscardElement::hasValidAttributeType()
+{
+    // Even if there is no targetElement, discard is still a valid animation as it has to delete itself.
+    return true;
+}
+
+bool SVGDiscardElement::hasValidAttributeName()
+{
+    // discard does not use attributeName so it is always valid.
+    return true;
+}
+
+}