diff -r 000000000000 -r 6474c204b198 layout/xul/nsDocElementBoxFrame.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/nsDocElementBoxFrame.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,143 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "nsHTMLParts.h"
+#include "nsContainerFrame.h"
+#include "nsCSSRendering.h"
+#include "nsIDocument.h"
+#include "nsPageFrame.h"
+#include "nsIDOMEvent.h"
+#include "nsStyleConsts.h"
+#include "nsGkAtoms.h"
+#include "nsIPresShell.h"
+#include "nsBoxFrame.h"
+#include "nsStackLayout.h"
+#include "nsIAnonymousContentCreator.h"
+#include "nsINodeInfo.h"
+#include "nsIServiceManager.h"
+#include "nsNodeInfoManager.h"
+#include "nsContentCreatorFunctions.h"
+#include "nsContentUtils.h"
+#include "nsContentList.h"
+#include "mozilla/dom/Element.h"
+
+//#define DEBUG_REFLOW
+
+using namespace mozilla::dom;
+
+class nsDocElementBoxFrame : public nsBoxFrame,
+                             public nsIAnonymousContentCreator
+{
+public:
+  virtual void DestroyFrom(nsIFrame* aDestructRoot) MOZ_OVERRIDE;
+
+  friend nsIFrame* NS_NewBoxFrame(nsIPresShell* aPresShell,
+                                  nsStyleContext* aContext);
+
+  nsDocElementBoxFrame(nsIPresShell* aShell, nsStyleContext* aContext)
+    :nsBoxFrame(aShell, aContext, true) {}
+
+  NS_DECL_QUERYFRAME
+  NS_DECL_FRAMEARENA_HELPERS
+
+  // nsIAnonymousContentCreator
+  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) MOZ_OVERRIDE;
+  virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
+                                        uint32_t aFilter) MOZ_OVERRIDE;
+
+  virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
+  {
+    // Override nsBoxFrame.
+    if (aFlags & (nsIFrame::eReplacedContainsBlock | nsIFrame::eReplaced))
+      return false;
+    return nsBoxFrame::IsFrameOfType(aFlags);
+  }
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;
+#endif
+private:
+  nsCOMPtr<Element> mPopupgroupContent;
+  nsCOMPtr<Element> mTooltipContent;
+};
+
+//----------------------------------------------------------------------
+
+nsIFrame*
+NS_NewDocElementBoxFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
+{
+  return new (aPresShell) nsDocElementBoxFrame (aPresShell, aContext);
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsDocElementBoxFrame)
+
+void
+nsDocElementBoxFrame::DestroyFrom(nsIFrame* aDestructRoot)
+{
+  nsContentUtils::DestroyAnonymousContent(&mPopupgroupContent);
+  nsContentUtils::DestroyAnonymousContent(&mTooltipContent);
+  nsBoxFrame::DestroyFrom(aDestructRoot);
+}
+
+nsresult
+nsDocElementBoxFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
+{
+  nsIDocument* doc = mContent->GetDocument();
+  if (!doc) {
+    // The page is currently being torn down.  Why bother.
+    return NS_ERROR_FAILURE;
+  }
+  nsNodeInfoManager *nodeInfoManager = doc->NodeInfoManager();
+
+  // create the top-secret popupgroup node. shhhhh!
+  nsCOMPtr<nsINodeInfo> nodeInfo;
+  nodeInfo = nodeInfoManager->GetNodeInfo(nsGkAtoms::popupgroup,
+                                          nullptr, kNameSpaceID_XUL,
+                                          nsIDOMNode::ELEMENT_NODE);
+  NS_ENSURE_TRUE(nodeInfo, NS_ERROR_OUT_OF_MEMORY);
+
+  nsresult rv = NS_NewXULElement(getter_AddRefs(mPopupgroupContent),
+                                 nodeInfo.forget());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (!aElements.AppendElement(mPopupgroupContent))
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  // create the top-secret default tooltip node. shhhhh!
+  nodeInfo = nodeInfoManager->GetNodeInfo(nsGkAtoms::tooltip, nullptr,
+                                          kNameSpaceID_XUL,
+                                          nsIDOMNode::ELEMENT_NODE);
+  NS_ENSURE_TRUE(nodeInfo, NS_ERROR_OUT_OF_MEMORY);
+
+  rv = NS_NewXULElement(getter_AddRefs(mTooltipContent), nodeInfo.forget());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mTooltipContent->SetAttr(kNameSpaceID_None, nsGkAtoms::_default,
+                           NS_LITERAL_STRING("true"), false);
+
+  if (!aElements.AppendElement(mTooltipContent))
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  return NS_OK;
+}
+
+void
+nsDocElementBoxFrame::AppendAnonymousContentTo(nsBaseContentList& aElements,
+                                               uint32_t aFilter)
+{
+  aElements.MaybeAppendElement(mPopupgroupContent);
+  aElements.MaybeAppendElement(mTooltipContent);
+}
+
+NS_QUERYFRAME_HEAD(nsDocElementBoxFrame)
+  NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
+NS_QUERYFRAME_TAIL_INHERITING(nsBoxFrame)
+
+#ifdef DEBUG_FRAME_DUMP
+nsresult
+nsDocElementBoxFrame::GetFrameName(nsAString& aResult) const
+{
+  return MakeFrameName(NS_LITERAL_STRING("DocElementBox"), aResult);
+}
+#endif