diff -r 000000000000 -r 6474c204b198 layout/tools/layout-debug/src/nsLayoutDebuggingTools.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/tools/layout-debug/src/nsLayoutDebuggingTools.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+// vim:cindent:tabstop=4:expandtab:shiftwidth=4:
+/* 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/. */
+
+#ifndef nsLayoutDebuggingTools_h
+#define nsLayoutDebuggingTools_h
+
+#include "nsILayoutDebuggingTools.h"
+#include "nsIDocShell.h"
+#include "nsCOMPtr.h"
+
+class nsLayoutDebuggingTools : public nsILayoutDebuggingTools {
+
+public:
+    nsLayoutDebuggingTools();
+    virtual ~nsLayoutDebuggingTools();
+
+    NS_DECL_ISUPPORTS
+
+    NS_DECL_NSILAYOUTDEBUGGINGTOOLS
+
+protected:
+    void ForceRefresh();
+    nsresult GetBoolPref(const char * aPrefName, bool *aValue);
+    nsresult SetBoolPrefAndRefresh(const char * aPrefName, bool aNewValue);
+
+    nsCOMPtr<nsIDocShell> mDocShell;
+
+    bool mEditorMode;
+    bool mVisualDebugging;
+    bool mVisualEventDebugging;
+    bool mPaintFlashing;
+    bool mPaintDumping;
+    bool mInvalidateDumping;
+    bool mEventDumping;
+    bool mMotionEventDumping;
+    bool mCrossingEventDumping;
+    bool mReflowCounts;
+};
+
+#endif