Move viewport unit resolution to style recalc time

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index 25a940938b40222011ec24b4e557760485c1ba9d..6ec3c9966f5c9994ae67ccef7604c80fa6e55d2a 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -734,6 +734,9 @@ PassRefPtr<RenderStyle> StyleResolver::styleForElement(Element* element, RenderS
 
     setAnimationUpdateIfNeeded(state, *element);
 
+    if (state.style()->hasViewportUnits())
+        document().setHasViewportUnits();
+
     // Now return the style.
     return state.takeStyle();
 }
@@ -918,6 +921,9 @@ PassRefPtr<RenderStyle> StyleResolver::pseudoStyleForElement(Element* e, const P
     if (PseudoElement* pseudoElement = e->pseudoElement(pseudoStyleRequest.pseudoId))
         setAnimationUpdateIfNeeded(state, *pseudoElement);
 
+    if (state.style()->hasViewportUnits())
+        document().setHasViewportUnits();
+
     // Now return the style.
     return state.takeStyle();
 }
@@ -1020,6 +1026,8 @@ bool StyleResolver::checkRegionStyle(Element* regionElement)
 void StyleResolver::updateFont(StyleResolverState& state)
 {
     state.fontBuilder().createFont(m_fontSelector, state.parentStyle(), state.style());
+    if (state.fontBuilder().fontSizeHasViewportUnits())
+        state.style()->setHasViewportUnits();
 }
 
 PassRefPtr<StyleRuleList> StyleResolver::styleRulesForElement(Element* element, unsigned rulesToInclude)
@@ -1428,7 +1436,7 @@ void StyleResolver::addMediaQueryResults(const MediaQueryResultList& list)
         m_viewportDependentMediaQueryResults.append(list[i]);
 }
 
-bool StyleResolver::affectedByViewportChange() const
+bool StyleResolver::mediaQueryAffectedByViewportChange() const
 {
     for (unsigned i = 0; i < m_viewportDependentMediaQueryResults.size(); ++i) {
         if (m_medium->eval(&m_viewportDependentMediaQueryResults[i]->m_expression) != m_viewportDependentMediaQueryResults[i]->m_result)