Recalc styles on resize if we have viewport units.

Source/WebCore/dom/Document.cpp

Index: Source/WebCore/dom/Document.cpp
diff --git a/Source/WebCore/dom/Document.cpp b/Source/WebCore/dom/Document.cpp
index 1fdd8fb6682bd0a39ff8bc57e846eb4775424b3b..57f6c4653ef8951887cd03d9076acf0839b5ff2c 100644
--- a/Source/WebCore/dom/Document.cpp
+++ b/Source/WebCore/dom/Document.cpp
@@ -1810,6 +1810,9 @@ void Document::recalcStyle(StyleChange change)
     if (m_elemSheet && m_elemSheet->contents()->usesRemUnits())
         m_styleSheetCollection->setUsesRemUnit(true);
 
+    if (m_elemSheet && m_elemSheet->contents()->usesViewportUnits())
+        m_styleSheetCollection->setUsesViewportUnit(true);
+
     m_inStyleRecalc = true;
     {
         PostAttachCallbackDisabler disabler(this);
@@ -2667,6 +2670,9 @@ void Document::updateBaseURL()
         m_elemSheet = CSSStyleSheet::createInline(this, m_baseURL);
         // FIXME: So we are not really the parser. The right fix is to eliminate the element sheet completely.
         m_elemSheet->contents()->parserSetUsesRemUnits(usesRemUnits);
+
+        bool usesViewportUnits = m_elemSheet->contents()->usesViewportUnits();
+        m_elemSheet->contents()->parserSetUsesViewportUnits(usesViewportUnits);
     }
 
     if (!equalIgnoringFragmentIdentifier(oldBaseURL, m_baseURL)) {
@@ -4449,6 +4455,9 @@ void Document::finishedParsing()
     if (!m_documentTiming.domContentLoadedEventEnd)
         m_documentTiming.domContentLoadedEventEnd = monotonicallyIncreasingTime();
 
+    if (m_elemSheet && m_elemSheet->contents()->usesViewportUnits())
+        m_styleSheetCollection->setUsesViewportUnit(true);
+
     if (RefPtr<Frame> f = frame()) {
         // FrameLoader::finishedParsing() might end up calling Document::implicitClose() if all
         // resource loads are complete. HTMLObjectElements can start loading their resources from