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diff --git a/Source/WebCore/loader/LoadTiming.h b/Source/WebCore/loader/LoadTiming.h
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+++ b/Source/WebCore/loader/LoadTiming.h
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+/*
+ * Copyright (C) 2010 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:
+ * 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 GOOGLE INC. ``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 GOOGLE INC. 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.
+ */
+
+#pragma once
+
+#include <wtf/CurrentTime.h>
+#include <wtf/MonotonicTime.h>
+#include <wtf/WallTime.h>
+
+namespace WebCore {
+
+class URL;
+
+class LoadTiming {
+public:
+    Seconds secondsSinceStartTime(MonotonicTime) const;
+    WallTime monotonicTimeToPseudoWallTime(MonotonicTime) const;
+
+    void markStartTime();
+    void addRedirect(const URL& redirectingUrl, const URL& redirectedUrl);
+
+    void markStartTimeAndFetchStart() { markStartTime(); m_fetchStart = m_startTime; }
+
+    void markUnloadEventStart() { m_unloadEventStart = MonotonicTime::now(); }
+    void markUnloadEventEnd() { m_unloadEventEnd = MonotonicTime::now(); }
+    void markRedirectStart() { m_redirectStart = MonotonicTime::now(); }
+    void markRedirectEnd() { m_redirectEnd = MonotonicTime::now(); }
+    void markFetchStart() { m_fetchStart = MonotonicTime::now(); }
+    void setResponseEnd(MonotonicTime time) { m_responseEnd = time; }
+    void markLoadEventStart() { m_loadEventStart = MonotonicTime::now(); }
+    void markLoadEventEnd() { m_loadEventEnd = MonotonicTime::now(); }
+
+    void setHasSameOriginAsPreviousDocument(bool value) { m_hasSameOriginAsPreviousDocument = value; }
+
+    MonotonicTime startTime() const { return m_startTime; }
+    MonotonicTime unloadEventStart() const { return m_unloadEventStart; }
+    MonotonicTime unloadEventEnd() const { return m_unloadEventEnd; }
+    MonotonicTime redirectStart() const { return m_redirectStart; }
+    MonotonicTime redirectEnd() const { return m_redirectEnd; }
+    MonotonicTime fetchStart() const { return m_fetchStart; }
+    MonotonicTime responseEnd() const { return m_responseEnd; }
+    MonotonicTime loadEventStart() const { return m_loadEventStart; }
+    MonotonicTime loadEventEnd() const { return m_loadEventEnd; }
+    short redirectCount() const { return m_redirectCount; }
+    bool hasCrossOriginRedirect() const { return m_hasCrossOriginRedirect; }
+    bool hasSameOriginAsPreviousDocument() const { return m_hasSameOriginAsPreviousDocument; }
+
+    MonotonicTime referenceMonotonicTime() const { return m_referenceMonotonicTime; }
+    WallTime referenceWallTime() const { return m_referenceWallTime; }
+
+    LoadTiming isolatedCopy() const;
+
+private:
+    WallTime m_referenceWallTime;
+    MonotonicTime m_referenceMonotonicTime;
+    MonotonicTime m_startTime;
+    MonotonicTime m_unloadEventStart;
+    MonotonicTime m_unloadEventEnd;
+    MonotonicTime m_redirectStart;
+    MonotonicTime m_redirectEnd;
+    MonotonicTime m_fetchStart;
+    MonotonicTime m_responseEnd;
+    MonotonicTime m_loadEventStart;
+    MonotonicTime m_loadEventEnd;
+    short m_redirectCount { 0 };
+    bool m_hasCrossOriginRedirect { false };
+    bool m_hasSameOriginAsPreviousDocument { false };
+};
+
+} // namespace WebCore