Add a UseCounter for WebKitCSSMatrix

Source/core/css/CSSMatrix.cpp

Index: Source/core/css/CSSMatrix.cpp
diff --git a/Source/core/css/CSSMatrix.cpp b/Source/core/css/CSSMatrix.cpp
index 4ae6ebb046c7c2e1c58c14374d887ad0c1eca96e..18c0099a236f0ab26ecd5b241b7638833c41478a 100644
--- a/Source/core/css/CSSMatrix.cpp
+++ b/Source/core/css/CSSMatrix.cpp
@@ -34,12 +34,19 @@
 #include "core/css/parser/CSSParser.h"
 #include "core/css/resolver/TransformBuilder.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/frame/UseCounter.h"
 #include "core/rendering/style/RenderStyle.h"
 #include "core/rendering/style/StyleInheritedData.h"
 #include "wtf/MathExtras.h"
 
 namespace blink {
 
+PassRefPtrWillBeRawPtr<CSSMatrix> CSSMatrix::create(ExecutionContext* executionContext, const String& s, ExceptionState& exceptionState)
+{
+    UseCounter::count(executionContext, UseCounter::WebKitCSSMatrix);
+    return adoptRefWillBeNoop(new CSSMatrix(s, exceptionState));
+}
+
 CSSMatrix::CSSMatrix(const TransformationMatrix& m)
     : m_matrix(m)
 {