Move viewport unit resolution to style recalc time

Source/core/css/CSSGradientValue.cpp

 /*
  * Copyright (C) 2008 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
@@ skipping 45 matching lines @@
         // Need to look up our size.  Create a string of width*height to use as a hash key.
         Image* result = getImage(renderer, size);
         if (result)
             return result;
     }
 
     // We need to create an image.
     RefPtr<Gradient> gradient;
 
     RenderStyle* rootStyle = renderer->document().documentElement()->renderStyle();
-    CSSToLengthConversionData conversionData(renderer->style(), rootStyle);
+    CSSToLengthConversionData conversionData(renderer->style(), rootStyle, renderer->view());
     if (isLinearGradientValue())
         gradient = toCSSLinearGradientValue(this)->createGradient(conversionData, size);
     else
         gradient = toCSSRadialGradientValue(this)->createGradient(conversionData, size);
 
     RefPtr<Image> newImage = GradientGeneratedImage::create(gradient, size);
     if (cacheable)
         putImage(size, newImage);
 
     return newImage.release();
@@ skipping 1078 matching lines @@
         equalHorizontalAndVerticalSize = compareCSSValuePtr(m_endHorizontalSize, other.m_endHorizontalSize) && compareCSSValuePtr(m_endVerticalSize, other.m_endVerticalSize);
     else {
         equalShape = !other.m_shape;
         equalSizingBehavior = !other.m_sizingBehavior;
         equalHorizontalAndVerticalSize = !other.m_endHorizontalSize && !other.m_endVerticalSize;
     }
     return equalShape && equalSizingBehavior && equalHorizontalAndVerticalSize && m_stops == other.m_stops;
 }
 
 } // namespace WebCore