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diff --git a/Source/WebCore/inspector/MemoryInstrumentationImpl.cpp b/Source/WebCore/inspector/MemoryInstrumentationImpl.cpp
new file mode 100644
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+++ b/Source/WebCore/inspector/MemoryInstrumentationImpl.cpp
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+/*
+ * Copyright (C) 2012 Google 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:
+ *
+ *     * 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"
+
+#if ENABLE(INSPECTOR)
+
+#include "MemoryInstrumentationImpl.h"
+
+namespace WebCore {
+
+MemoryInstrumentationImpl::MemoryInstrumentationImpl(VisitedObjects& visitedObjects)
+    : m_visitedObjects(visitedObjects)
+{
+    for (int i = 0; i < LastTypeEntry; ++i)
+        m_totalSizes[i] = 0;
+}
+
+void MemoryInstrumentationImpl::processDeferredInstrumentedPointers()
+{
+    while (!m_deferredInstrumentedPointers.isEmpty()) {
+        OwnPtr<InstrumentedPointerBase> pointer = m_deferredInstrumentedPointers.last().release();
+        m_deferredInstrumentedPointers.removeLast();
+        pointer->process(this);
+    }
+}
+
+void MemoryInstrumentationImpl::countObjectSize(ObjectType objectType, size_t size)
+{
+    ASSERT(objectType >= 0 && objectType < LastTypeEntry);
+    m_totalSizes[objectType] += size;
+}
+
+void MemoryInstrumentationImpl::deferInstrumentedPointer(PassOwnPtr<InstrumentedPointerBase> pointer)
+{
+    m_deferredInstrumentedPointers.append(pointer);
+}
+
+bool MemoryInstrumentationImpl::visited(const void* object)
+{
+    return !m_visitedObjects.add(object).isNewEntry;
+}
+
+size_t MemoryInstrumentationImpl::selfSize() const
+{
+    return calculateContainerSize(m_visitedObjects) + calculateContainerSize(m_deferredInstrumentedPointers);
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(INSPECTOR)