diff -r 000000000000 -r 6474c204b198 layout/inspector/inLayoutUtils.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/inspector/inLayoutUtils.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,103 @@
+/* -*- 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 "inLayoutUtils.h"
+
+#include "nsIDocument.h"
+#include "nsIDOMDocument.h"
+#include "nsIContent.h"
+#include "nsIContentViewer.h"
+#include "nsPIDOMWindow.h"
+#include "nsIDocShell.h"
+#include "nsIPresShell.h"
+#include "nsPresContext.h"
+#include "mozilla/EventStateManager.h"
+#include "mozilla/dom/Element.h"
+
+using namespace mozilla;
+
+///////////////////////////////////////////////////////////////////////////////
+
+nsIDOMWindow*
+inLayoutUtils::GetWindowFor(nsIDOMNode* aNode)
+{
+  nsCOMPtr<nsIDOMDocument> doc1;
+  aNode->GetOwnerDocument(getter_AddRefs(doc1));
+  return GetWindowFor(doc1.get());
+}
+
+nsIDOMWindow*
+inLayoutUtils::GetWindowFor(nsIDOMDocument* aDoc)
+{
+  nsCOMPtr<nsIDOMWindow> window;
+  aDoc->GetDefaultView(getter_AddRefs(window));
+  return window;
+}
+
+nsIPresShell* 
+inLayoutUtils::GetPresShellFor(nsISupports* aThing)
+{
+  nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aThing);
+
+  return window->GetDocShell()->GetPresShell();
+}
+
+/*static*/
+nsIFrame*
+inLayoutUtils::GetFrameFor(nsIDOMElement* aElement)
+{
+  nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
+  return content->GetPrimaryFrame();
+}
+
+EventStateManager*
+inLayoutUtils::GetEventStateManagerFor(nsIDOMElement *aElement)
+{
+  NS_PRECONDITION(aElement, "Passing in a null element is bad");
+
+  nsCOMPtr<nsIDOMDocument> domDoc;
+  aElement->GetOwnerDocument(getter_AddRefs(domDoc));
+  nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDoc);
+
+  if (!doc) {
+    NS_WARNING("Could not get an nsIDocument!");
+    return nullptr;
+  }
+
+  nsIPresShell *shell = doc->GetShell();
+  if (!shell)
+    return nullptr;
+
+  return shell->GetPresContext()->EventStateManager();
+}
+
+nsIDOMDocument*
+inLayoutUtils::GetSubDocumentFor(nsIDOMNode* aNode)
+{
+  nsCOMPtr<nsIContent> content = do_QueryInterface(aNode);
+  if (content) {
+    nsCOMPtr<nsIDocument> doc = content->GetDocument();
+    if (doc) {
+      nsCOMPtr<nsIDOMDocument> domdoc(do_QueryInterface(doc->GetSubDocumentFor(content)));
+
+      return domdoc;
+    }
+  }
+
+  return nullptr;
+}
+
+nsIDOMNode*
+inLayoutUtils::GetContainerFor(const nsIDocument& aDoc)
+{
+  nsPIDOMWindow* pwin = aDoc.GetWindow();
+  if (!pwin) {
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIDOMNode> node = do_QueryInterface(pwin->GetFrameElementInternal());
+  return node;
+}
+