Move viewport unit resolution to style recalc time

Source/platform/LengthFunctions.cpp

 /*
     Copyright (C) 1999 Lars Knoll (knoll@kde.org)
     Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
     Copyright (C) 2011 Rik Cabanier (cabanier@adobe.com)
     Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
     Copyright (C) 2012 Motorola Mobility, Inc. All rights reserved.
 
     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
@@ skipping 11 matching lines @@
 */
 
 #include "config.h"
 #include "platform/LengthFunctions.h"
 
 #include "platform/LayoutUnit.h"
 #include "platform/Length.h"
 
 namespace WebCore {
 
-// This method is over-ridden in core/css/CSSLengthFunctions.cpp.
-// Any changes here most likely also need to be applied there.
 float floatValueForLength(const Length& length, float maximumValue)
 {
     switch (length.type()) {
     case Fixed:
         return length.getFloatValue();
     case Percent:
         return static_cast<float>(maximumValue * length.percent() / 100.0f);
     case FillAvailable:
     case Auto:
         return static_cast<float>(maximumValue);
     case Calculated:
         return length.nonNanCalculatedValue(maximumValue);
-    case ViewportPercentageWidth:
-    case ViewportPercentageHeight:
-    case ViewportPercentageMin:
-    case ViewportPercentageMax:
-        return 0;
     case Intrinsic:
     case MinIntrinsic:
     case MinContent:
     case MaxContent:
     case FitContent:
     case ExtendToZoom:
+    case DeviceWidth:
+    case DeviceHeight:
     case Undefined:
         ASSERT_NOT_REACHED();
         return 0;
     }
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 } // namespace WebCore