Add use-counters for use of CSS parsing in WebkitCSSMatrix.

third_party/WebKit/Source/core/css/CSSMatrix.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 28 matching lines @@
 #include "core/style/ComputedStyle.h"
 #include "core/style/StyleInheritedData.h"
 #include "wtf/MathExtras.h"
 
 namespace blink {
 
 CSSMatrix* CSSMatrix::create(ExecutionContext* executionContext,
                              const String& s,
                              ExceptionState& exceptionState) {
   UseCounter::count(executionContext, UseCounter::WebKitCSSMatrix);
+  if (!s.isEmpty()) {
+    UseCounter::count(executionContext,
+                      UseCounter::WebkitCSSMatrixConstructFromString);
+  }
   return new CSSMatrix(s, exceptionState);
 }
 
 CSSMatrix::CSSMatrix(const TransformationMatrix& m)
     : m_matrix(TransformationMatrix::create(m)) {}
 
 CSSMatrix::CSSMatrix(const String& s, ExceptionState& exceptionState)
     : m_matrix(TransformationMatrix::create()) {
   setMatrixValue(s, exceptionState);
 }
@@ skipping 136 matching lines @@
   return String::format(
       "matrix3d(%f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, "
       "%f)",
       m_matrix->m11(), m_matrix->m12(), m_matrix->m13(), m_matrix->m14(),
       m_matrix->m21(), m_matrix->m22(), m_matrix->m23(), m_matrix->m24(),
       m_matrix->m31(), m_matrix->m32(), m_matrix->m33(), m_matrix->m34(),
       m_matrix->m41(), m_matrix->m42(), m_matrix->m43(), m_matrix->m44());
 }
 
 }  // namespace blink