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diff --git a/Source/WebCore/dom/ViewportArguments.h b/Source/WebCore/dom/ViewportArguments.h
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+++ b/Source/WebCore/dom/ViewportArguments.h
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+/*
+ * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
+ *           (C) 1999 Antti Koivisto (koivisto@kde.org)
+ *           (C) 2001 Dirk Mueller (mueller@kde.org)
+ *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef ViewportArguments_h
+#define ViewportArguments_h
+
+#include "IntSize.h"
+#include <wtf/Forward.h>
+
+namespace WebCore {
+
+class Document;
+
+enum ViewportErrorCode {
+    DeviceWidthShouldBeUsedWarning,
+    DeviceHeightShouldBeUsedWarning,
+    UnrecognizedViewportArgumentError,
+    MaximumScaleTooLargeError,
+    TargetDensityDpiTooSmallOrLargeError
+};
+
+struct ViewportAttributes {
+    IntSize layoutSize;
+
+    float devicePixelRatio;
+
+    float initialScale;
+    float minimumScale;
+    float maximumScale;
+
+    bool userScalable;
+};
+
+struct ViewportArguments {
+
+    enum {
+        ValueAuto = -1,
+        ValueDesktopWidth = -2,
+        ValueDeviceWidth = -3,
+        ValueDeviceHeight = -4,
+        ValueDeviceDPI = -5,
+        ValueLowDPI = -6,
+        ValueMediumDPI = -7,
+        ValueHighDPI = -8
+    };
+
+    ViewportArguments()
+        : initialScale(ValueAuto)
+        , minimumScale(ValueAuto)
+        , maximumScale(ValueAuto)
+        , width(ValueAuto)
+        , height(ValueAuto)
+        , targetDensityDpi(ValueAuto)
+        , userScalable(true)
+    {
+    }
+
+    float initialScale;
+    float minimumScale;
+    float maximumScale;
+    float width;
+    float height;
+    float targetDensityDpi;
+
+    bool userScalable;
+
+    bool operator==(const ViewportArguments& other) const
+    {
+        return initialScale == other.initialScale
+            && minimumScale == other.minimumScale
+            && maximumScale == other.maximumScale
+            && width == other.width
+            && height == other.height
+            && targetDensityDpi == other.targetDensityDpi
+            && userScalable == other.userScalable;
+    }
+};
+
+ViewportAttributes computeViewportAttributes(ViewportArguments args, int desktopWidth, int deviceWidth, int deviceHeight, int deviceDPI, IntSize visibleViewport);
+
+void setViewportFeature(const String& keyString, const String& valueString, Document*, void* data);
+void reportViewportWarning(Document*, ViewportErrorCode, const String& replacement);
+
+} // namespace WebCore
+
+#endif // ViewportArguments_h