diff -r 000000000000 -r 6474c204b198 xpcom/base/nsDebugImpl.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/base/nsDebugImpl.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+/* 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 nsDebugImpl_h
+#define nsDebugImpl_h
+
+#include "nsIDebug.h"
+#include "nsIDebug2.h"
+
+class nsDebugImpl : public nsIDebug2
+{
+public:
+    nsDebugImpl() {}
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIDEBUG
+    NS_DECL_NSIDEBUG2
+
+    static nsresult Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr);
+
+    /*
+     * Inform nsDebugImpl that we're in multiprocess mode.
+     *
+     * If aDesc is not nullptr, the string it points to must be
+     * statically-allocated (i.e., it must be a string literal).
+     */
+    static void SetMultiprocessMode(const char *aDesc);
+};
+
+
+#define NS_DEBUG_CONTRACTID "@mozilla.org/xpcom/debug;1"
+#define NS_DEBUG_CID                                 \
+{ /* a80b1fb3-aaf6-4852-b678-c27eb7a518af */         \
+  0xa80b1fb3,                                        \
+    0xaaf6,                                          \
+    0x4852,                                          \
+    {0xb6, 0x78, 0xc2, 0x7e, 0xb7, 0xa5, 0x18, 0xaf} \
+}
+
+#endif // nsDebugImpl_h