Move viewport unit resolution to style recalc time

Source/core/css/CSSToLengthConversionData.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/css/CSSToLengthConversionData.h"
 
+#include "core/rendering/RenderView.h"
 #include "core/rendering/style/RenderStyle.h"
 
 namespace WebCore {
 
 float CSSToLengthConversionData::zoom() const
 {
     if (m_useEffectiveZoom)
         return m_style ? m_style->effectiveZoom() : 1;
     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