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diff --git a/Source/WebCore/page/ActivityState.h b/Source/WebCore/page/ActivityState.h
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+/*
+ * Copyright (C) 2013 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.
+ */
+
+#pragma once
+
+namespace WebCore {
+
+struct ActivityState {
+    enum {
+        WindowIsActive = 1 << 0,
+        IsFocused = 1 << 1,
+        IsVisible = 1 << 2,
+        IsVisibleOrOccluded = 1 << 3,
+        IsInWindow = 1 << 4,
+        IsVisuallyIdle = 1 << 5,
+        IsAudible = 1 << 6,
+        IsLoading = 1 << 7,
+    };
+
+    typedef unsigned Flags;
+
+    static const Flags NoFlags = 0;
+    static const Flags AllFlags = WindowIsActive | IsFocused | IsVisible | IsVisibleOrOccluded | IsInWindow | IsVisuallyIdle | IsAudible | IsLoading;
+};
+
+enum class ActivityStateForCPUSampling {
+    NonVisible,
+    VisibleNonActive,
+    VisibleAndActive
+};
+
+} // namespace WebCore