Add UseCounter for SVGURIReference.href.baseVal/animVal.

Source/core/svg/SVGAnimatedString.cpp

Index: Source/core/svg/SVGAnimatedString.cpp
diff --git a/Source/core/svg/SVGAnimatedString.cpp b/Source/core/svg/SVGAnimatedString.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..0628979262603f4a67b850e01a425bc8811d0557
--- /dev/null
+++ b/Source/core/svg/SVGAnimatedString.cpp
@@ -0,0 +1,35 @@
+// Copyright 2015 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.
+
+#include "config.h"
+#include "core/svg/SVGAnimatedString.h"
+
+#include "core/XLinkNames.h"
+#include "core/frame/UseCounter.h"
+#include "core/svg/SVGElement.h"
+
+namespace blink {
+
+WTF::String SVGAnimatedString::baseVal()
+{
+    if (this->attributeName() == XLinkNames::hrefAttr)
+        UseCounter::count(this->contextElement()->document(), UseCounter::SVGHrefBaseVal);
+    return SVGAnimatedProperty<SVGString>::baseVal();
+}
+
+void SVGAnimatedString::setBaseVal(WTF::String value, blink::ExceptionState& exceptionState)
+{
+    if (this->attributeName() == XLinkNames::hrefAttr)
+        UseCounter::count(this->contextElement()->document(), UseCounter::SVGHrefBaseVal);
+    return SVGAnimatedProperty<SVGString>::setBaseVal(value, exceptionState);
+}
+
+WTF::String SVGAnimatedString::animVal()
+{
+    if (this->attributeName() == XLinkNames::hrefAttr)
+        UseCounter::count(this->contextElement()->document(), UseCounter::SVGHrefAnimVal);
+    return SVGAnimatedProperty<SVGString>::animVal();
+}
+
+} // namespace blink