NOT FOR REVIEW: Fullscreen WIP

third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc.
  * All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
@@ skipping 161 matching lines @@
   for (ShadowRoot* shadowRoot = &shadow->youngestShadowRoot(); shadowRoot;
        shadowRoot = shadowRoot->olderShadowRoot()) {
     if (shadowRoot->numberOfStyles() > 0) {
       if (ScopedStyleResolver* resolver = shadowRoot->scopedStyleResolver())
         resolvers.append(resolver);
     }
   }
 }
 
 StyleResolver::StyleResolver(Document& document)
-    : m_document(document),
-      m_printMediaType(false),
-      m_styleSharingDepth(0) {
+    : m_document(document), m_printMediaType(false), m_styleSharingDepth(0) {
   FrameView* view = document.view();
   DCHECK(view);
   m_medium = new MediaQueryEvaluator(&view->frame());
   m_printMediaType =
       equalIgnoringCase(view->mediaType(), MediaTypeNames::print);
 }
 
 StyleResolver::~StyleResolver() {}
 
 void StyleResolver::dispose() {
@@ skipping 657 matching lines @@
     return nullptr;
 
   if (pseudoId == PseudoIdBackdrop && !parent.isInTopLayer())
     return nullptr;
 
   if (pseudoId == PseudoIdFirstLetter &&
       (parent.isSVGElement() ||
        !FirstLetterPseudoElement::firstLetterTextLayoutObject(parent)))
     return nullptr;
 
-  if (!canHaveGeneratedChildren(*parentLayoutObject))
+  // The backdrop pseudo element generates a new stacking context and its
+  // layout object does not become a child of |parentLayoutObject|. The
+  // exemption is needed so that replaced content also gets a backdrop.
+  if (pseudoId != PseudoIdBackdrop &&
+      !canHaveGeneratedChildren(*parentLayoutObject))
     return nullptr;
 
   ComputedStyle* parentStyle = parentLayoutObject->mutableStyle();
   if (ComputedStyle* cachedStyle =
           parentStyle->getCachedPseudoStyle(pseudoId)) {
     if (!pseudoElementLayoutObjectIsNeeded(cachedStyle))
       return nullptr;
     return createPseudoElement(&parent, pseudoId);
   }
 
@@ skipping 956 matching lines @@
   visitor->trace(m_medium);
   visitor->trace(m_viewportDependentMediaQueryResults);
   visitor->trace(m_deviceDependentMediaQueryResults);
   visitor->trace(m_selectorFilter);
   visitor->trace(m_styleSharingLists);
   visitor->trace(m_pendingStyleSheets);
   visitor->trace(m_document);
 }
 
 }  // namespace blink