Recalc styles on resize if we have viewport units.

Source/WebCore/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 1792 matching lines @@
     // hits a null-dereference due to security code always assuming the document has a SecurityOrigin.
 
     if (m_styleSheetCollection->needsUpdateActiveStylesheetsOnStyleRecalc())
         m_styleSheetCollection->updateActiveStyleSheets(DocumentStyleSheetCollection::FullUpdate);
 
     InspectorInstrumentationCookie cookie = InspectorInstrumentation::willRecalculateStyle(this);
 
     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);
         WidgetHierarchyUpdatesSuspensionScope suspendWidgetHierarchyUpdates;
 
         RefPtr<FrameView> frameView = view();
         if (frameView) {
             frameView->pauseScheduledEvents();
             frameView->beginDeferredRepaints();
         }
@@ skipping 837 matching lines @@
     if (!m_baseURL.isValid())
         m_baseURL = KURL();
 
     if (m_elemSheet) {
         // Element sheet is silly. It never contains anything.
         ASSERT(!m_elemSheet->contents()->ruleCount());
         bool usesRemUnits = m_elemSheet->contents()->usesRemUnits();
         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)) {
         // Base URL change changes any relative visited links.
         // FIXME: There are other URLs in the tree that would need to be re-evaluated on dynamic base URL change. Style should be invalidated too.
         for (Element* element = ElementTraversal::firstWithin(this); element; element = ElementTraversal::next(element)) {
             if (element->hasTagName(aTag))
                 static_cast<HTMLAnchorElement*>(element)->invalidateCachedVisitedLinkHash();
         }
     }
@@ skipping 1762 matching lines @@
 {
     ASSERT(!scriptableDocumentParser() || !m_parser->isParsing());
     ASSERT(!scriptableDocumentParser() || m_readyState != Loading);
     setParsing(false);
     if (!m_documentTiming.domContentLoadedEventStart)
         m_documentTiming.domContentLoadedEventStart = monotonicallyIncreasingTime();
     dispatchEvent(Event::create(eventNames().DOMContentLoadedEvent, true, false));
     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
         // post attach callbacks triggered by recalcStyle().  This means if we parse out an <object>
         // tag and then reach the end of the document without updating styles, we might not have yet
         // started the resource load and might fire the window load event too early.  To avoid this
         // we force the styles to be up to date before calling FrameLoader::finishedParsing().
         // See https://bugs.webkit.org/show_bug.cgi?id=36864 starting around comment 35.
         updateStyleIfNeeded();
 
@@ skipping 1652 matching lines @@
         return;
 
     Vector<RefPtr<Element> > associatedFormControls;
     copyToVector(m_associatedFormControls, associatedFormControls);
 
     frame()->page()->chrome()->client()->didAssociateFormControls(associatedFormControls);
     m_associatedFormControls.clear();
 }
 
 } // namespace WebCore