Reland "Implement FullScreen using top layer."

third_party/WebKit/Source/core/dom/PseudoElement.cpp

 /*
  * Copyright (C) 2012 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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 11 matching lines @@
  * 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 "core/dom/PseudoElement.h"
 
 #include "core/dom/FirstLetterPseudoElement.h"
 #include "core/frame/UseCounter.h"
 #include "core/inspector/InspectorInstrumentation.h"
+#include "core/layout/GeneratedChildren.h"
 #include "core/layout/LayoutObject.h"
 #include "core/layout/LayoutQuote.h"
 #include "core/style/ContentData.h"
 
 namespace blink {
 
 PseudoElement* PseudoElement::create(Element* parent, PseudoId pseudoId)
 {
     return new PseudoElement(parent, pseudoId);
 }
@@ skipping 75 matching lines @@
 void PseudoElement::attach(const AttachContext& context)
 {
     DCHECK(!layoutObject());
 
     Element::attach(context);
 
     LayoutObject* layoutObject = this->layoutObject();
     if (!layoutObject)
         return;
 
+    // This is to ensure that bypassing the canHaveGeneratedChildren check in
+    // StyleResolver::createPseudoElementIfNeeded does not result in the
+    // backdrop pseudo element's layout object becoming the child of a layout
+    // object that doesn't allow children.
+    DCHECK(layoutObject->parent());
+    DCHECK(canHaveGeneratedChildren(*layoutObject->parent()));
+
     ComputedStyle& style = layoutObject->mutableStyleRef();
     if (style.styleType() != PseudoIdBefore && style.styleType() != PseudoIdAfter)
         return;
     DCHECK(style.contentData());
 
     for (const ContentData* content = style.contentData(); content; content = content->next()) {
         LayoutObject* child = content->createLayoutObject(document(), style);
         if (layoutObject->isChildAllowed(child, style)) {
             layoutObject->addChild(child);
             if (child->isQuote())
@@ skipping 50 matching lines @@
     // us and our parent so make sure we skip over them.
     LayoutObject* ancestor = layoutObject()->parent();
     while (ancestor->isAnonymous() || (ancestor->node() && ancestor->node()->isPseudoElement())) {
         DCHECK(ancestor->parent());
         ancestor = ancestor->parent();
     }
     return ancestor->node();
 }
 
 } // namespace blink