Move viewport unit resolution to style recalc time

Source/core/css/MediaQueryEvaluator.cpp

 /*
  * CSS Media Query Evaluator
  *
  * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ skipping 332 matching lines @@
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
 
     if (primitiveValue->isNumber()) {
         result = primitiveValue->getIntValue();
         return !strict || !result;
     }
 
     if (primitiveValue->isLength()) {
         // Relative (like EM) and root relative (like REM) units are always resolved against
         // the initial values for media queries, hence the two initialStyle parameters.
-        result = primitiveValue->computeLength<int>(CSSToLengthConversionData(initialStyle, initialStyle, 1.0 /* zoom */, true /* computingFontSize */));
+        // FIXME: We need to plumb viewport unit support down to here.
+        result = primitiveValue->computeLength<int>(CSSToLengthConversionData(initialStyle, initialStyle, 0, 1.0 /* zoom */, true /* computingFontSize */));
         return true;
     }
 
     return false;
 }
 
 static bool deviceHeightMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix op)
 {
     if (value) {
         int length;
@@ skipping 322 matching lines @@
     // Call the media feature evaluation function. Assume no prefix and let
     // trampoline functions override the prefix if prefix is used.
     EvalFunc func = gFunctionMap->get(expr->mediaFeature().impl());
     if (func)
         return func(expr->value(), m_style.get(), m_frame, NoPrefix);
 
     return false;
 }
 
 } // namespace