Recompute percentage based @viewport on resize.

Source/core/dom/ViewportArguments.h

 /*
  * 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)
  * Copyright (C) 2012-2013 Intel Corporation. All rights reserved.
  *
@@ skipping 11 matching lines @@
  * 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 "core/page/PageScaleConstraints.h"
+#include "core/platform/Length.h"
 #include "core/platform/graphics/FloatSize.h"
 #include "wtf/Forward.h"
 
 namespace WebCore {
 
 class Document;
 
 enum ViewportErrorCode {
     UnrecognizedViewportArgumentKeyError,
     UnrecognizedViewportArgumentValueError,
@@ skipping 23 matching lines @@
         ValueDeviceDPI = -6,
         ValueLowDPI = -7,
         ValueMediumDPI = -8,
         ValueHighDPI = -9,
         ValueExtendToZoom = -10
     };
 
     ViewportArguments(Type type = Implicit)
         : type(type)
         , width(ValueAuto)
-        , minWidth(ValueAuto)
-        , maxWidth(ValueAuto)
         , height(ValueAuto)
-        , minHeight(ValueAuto)
-        , maxHeight(ValueAuto)
         , zoom(ValueAuto)
         , minZoom(ValueAuto)
         , maxZoom(ValueAuto)
         , userZoom(ValueAuto)
         , orientation(ValueAuto)
         , deprecatedTargetDensityDPI(ValueAuto)
     {
     }
 
     // All arguments are in CSS units.
     PageScaleConstraints resolve(const FloatSize& initialViewportSize, const FloatSize& deviceSize, int defaultWidth) const;
 
     float width;
-    float minWidth;
-    float maxWidth;
+    Length minWidth;
+    Length maxWidth;
     float height;
-    float minHeight;
-    float maxHeight;
+    Length minHeight;
+    Length maxHeight;
     float zoom;
     float minZoom;
     float maxZoom;
     float userZoom;
     float orientation;
     float deprecatedTargetDensityDPI; // Only used for Android WebView
 
     bool operator==(const ViewportArguments& other) const
     {
         // Used for figuring out whether to reset the viewport or not,
         // thus we are not taking type into account.
         return width == other.width
             && minWidth == other.minWidth
             && maxWidth == other.maxWidth
             && height == other.height
             && minHeight == other.minHeight
             && maxHeight == other.maxHeight
             && zoom == other.zoom
             && minZoom == other.minZoom
             && maxZoom == other.maxZoom
             && userZoom == other.userZoom
             && orientation == other.orientation
             && deprecatedTargetDensityDPI == other.deprecatedTargetDensityDPI;
     }
 
     bool operator!=(const ViewportArguments& other) const
     {
         return !(*this == other);
     }
+
+private:
+    enum Direction { Horizontal, Vertical };
+    static float resolveViewportLength(const Length&, const FloatSize& initialViewportSize, Direction);
 };
 
 void setViewportFeature(const String& keyString, const String& valueString, Document*, void* data);
 void reportViewportWarning(Document*, ViewportErrorCode, const String& replacement1, const String& replacement2);
 
 } // namespace WebCore
 
 #endif // ViewportArguments_h