NOT FOR REVIEW: Fullscreen WIP

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

Index: third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp b/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
index 701a69d21356084fa8e36e23d9a353dcd8aa1989..09c7bcb1175c686caf609fa4ea3bbee8bee217a3 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
@@ -179,9 +179,7 @@ static void collectScopedResolversForHostedShadowTrees(
 }
 
 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());
@@ -859,7 +857,11 @@ PseudoElement* StyleResolver::createPseudoElementIfNeeded(Element& parent,
        !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();