Move viewport unit resolution to style recalc time

Source/core/css/CSSToLengthConversionData.cpp

Index: Source/core/css/CSSToLengthConversionData.cpp
diff --git a/Source/core/css/CSSToLengthConversionData.cpp b/Source/core/css/CSSToLengthConversionData.cpp
index 6085a69892b23d5ba62dfdfddae7ebc43e620229..143692a4e76d76efa6db03e2c394b98e8c5a8027 100644
--- a/Source/core/css/CSSToLengthConversionData.cpp
+++ b/Source/core/css/CSSToLengthConversionData.cpp
@@ -31,6 +31,7 @@
 #include "config.h"
 #include "core/css/CSSToLengthConversionData.h"
 
+#include "core/rendering/RenderView.h"
 #include "core/rendering/style/RenderStyle.h"
 
 namespace WebCore {
@@ -42,4 +43,25 @@ float CSSToLengthConversionData::zoom() const
     return m_zoom;
 }
 
+double CSSToLengthConversionData::viewportWidthPercent() const
+{
+    m_style->setHasViewportUnits();
+    return m_renderView ? m_renderView->viewportWidthPercent() : 0;
+}
+double CSSToLengthConversionData::viewportHeightPercent() const
+{
+    m_style->setHasViewportUnits();
+    return m_renderView ? m_renderView->viewportHeightPercent() : 0;
+}
+double CSSToLengthConversionData::viewportMinPercent() const
+{
+    m_style->setHasViewportUnits();
+    return m_renderView ? m_renderView->viewportMinPercent() : 0;
+}
+double CSSToLengthConversionData::viewportMaxPercent() const
+{
+    m_style->setHasViewportUnits();
+    return m_renderView ? m_renderView->viewportMaxPercent() : 0;
+}
+
 } // namespace WebCore