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diff --git a/Source/WebCore/page/FeatureObserver.h b/Source/WebCore/page/FeatureObserver.h
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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:
+ * 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 APPLE COMPUTER, 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.
+ */
+
+#ifndef FeatureObserver_h
+#define FeatureObserver_h
+
+#include <wtf/BitVector.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/OwnPtr.h>
+#include <wtf/PassOwnPtr.h>
+
+namespace WebCore {
+
+class DOMWindow;
+class Document;
+
+class FeatureObserver {
+    WTF_MAKE_NONCOPYABLE(FeatureObserver);
+public:
+    FeatureObserver();
+    ~FeatureObserver();
+
+    enum Feature {
+        PageDestruction,
+        LegacyNotifications,
+        MultipartMainResource,
+        PrefixedIndexedDB,
+        WorkerStart,
+        SharedWorkerStart,
+        LegacyWebAudio,
+        WebAudioStart,
+        PrefixedContentSecurityPolicy,
+        UnprefixedIndexedDB,
+        OpenWebDatabase,
+        UnusedSlot01, // We used this slot for LegacyHTMLNotifications.
+        LegacyTextNotifications,
+        UnprefixedRequestAnimationFrame,
+        PrefixedRequestAnimationFrame,
+        ContentSecurityPolicy,
+        ContentSecurityPolicyReportOnly,
+        PrefixedContentSecurityPolicyReportOnly,
+        PrefixedTransitionEndEvent,
+        UnprefixedTransitionEndEvent,
+        PrefixedAndUnprefixedTransitionEndEvent,
+        AutoFocusAttribute,
+        AutoSaveAttribute,
+        DataListElement,
+        FormAttribute,
+        IncrementalAttribute,
+        InputTypeColor,
+        InputTypeDate,
+        InputTypeDateTime,
+        InputTypeDateTimeFallback,
+        InputTypeDateTimeLocal,
+        InputTypeEmail,
+        InputTypeMonth,
+        InputTypeNumber,
+        InputTypeRange,
+        InputTypeSearch,
+        InputTypeTel,
+        InputTypeTime,
+        InputTypeURL,
+        InputTypeWeek,
+        InputTypeWeekFallback,
+        ListAttribute,
+        MaxAttribute,
+        MinAttribute,
+        PatternAttribute,
+        PlaceholderAttribute,
+        PrecisionAttribute,
+        PrefixedDirectoryAttribute,
+        PrefixedSpeechAttribute,
+        RequiredAttribute,
+        ResultsAttribute,
+        StepAttribute,
+        PageVisits,
+        HTMLMarqueeElement,
+        CSSOverflowMarquee,
+        Reflection,
+        CursorVisibility,
+        StorageInfo,
+        XFrameOptions,
+        XFrameOptionsSameOrigin,
+        XFrameOptionsSameOriginWithBadAncestorChain,
+        DeprecatedFlexboxWebContent,
+        DeprecatedFlexboxChrome,
+        DeprecatedFlexboxChromeExtension,
+        // Add new features above this line. Don't change assigned numbers of each items.
+        NumberOfFeatures, // This enum value must be last.
+    };
+
+    static void observe(Document*, Feature);
+    static void observe(DOMWindow*, Feature);
+    void didCommitLoad();
+
+    const BitVector* accumulatedFeatureBits() const { return m_featureBits.get(); }
+
+private:
+    void didObserve(Feature feature)
+    {
+        ASSERT(feature != PageDestruction); // PageDestruction is reserved as a scaling factor.
+        ASSERT(feature < NumberOfFeatures);
+        if (!m_featureBits) {
+            m_featureBits = adoptPtr(new BitVector(NumberOfFeatures));
+            m_featureBits->clearAll();
+        }
+        m_featureBits->quickSet(feature);
+    }
+
+    void updateMeasurements();
+
+    OwnPtr<BitVector> m_featureBits;
+};
+
+} // namespace WebCore
+    
+#endif // FeatureObserver_h