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diff --git a/Tools/TestWebKitAPI/Counters.h b/Tools/TestWebKitAPI/Counters.h
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+/*
+ * Copyright (C) 2014 Igalia S.L.
+ * Copyright (C) 2014, 2016 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
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
+ */
+
+#ifndef Counters_h
+#define Counters_h
+
+struct CopyMoveCounter {
+    static unsigned constructionCount;
+    static unsigned copyCount;
+    static unsigned moveCount;
+
+    struct TestingScope {
+        TestingScope()
+        {
+            constructionCount = 0;
+            copyCount = 0;
+            moveCount = 0;
+        }
+    };
+
+    CopyMoveCounter() { constructionCount++; }
+    CopyMoveCounter(const CopyMoveCounter&) { copyCount++; }
+    CopyMoveCounter& operator=(const CopyMoveCounter&) { copyCount++; return *this; }
+    CopyMoveCounter(CopyMoveCounter&&) { moveCount++; }
+    CopyMoveCounter& operator=(CopyMoveCounter&&) { moveCount++; return *this; }
+};
+
+
+struct ConstructorDestructorCounter {
+    static unsigned constructionCount;
+    static unsigned destructionCount;
+
+    struct TestingScope {
+        TestingScope()
+        {
+            constructionCount = 0;
+            destructionCount = 0;
+        }
+    };
+
+    ConstructorDestructorCounter() { constructionCount++; }
+    ~ConstructorDestructorCounter() { destructionCount++; }
+};
+
+#if COMPILER(CLANG)
+#if __has_warning("-Wundefined-var-template")
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wundefined-var-template"
+#endif
+#endif
+template<typename T>
+struct DeleterCounter {
+    static unsigned m_deleterCount;
+
+    static unsigned deleterCount() { return m_deleterCount; }
+
+    struct TestingScope {
+        TestingScope()
+        {
+            m_deleterCount = 0;
+        }
+    };
+
+    void operator()(T* p) const
+    {
+        m_deleterCount++;
+        delete p;
+    }
+};
+#if COMPILER(CLANG)
+#if __has_warning("-Wundefined-var-template")
+#pragma clang diagnostic pop
+#endif
+#endif
+
+#endif // Counters_h