diff -r 000000000000 -r 6474c204b198 gfx/layers/ipc/ShadowLayerChild.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/layers/ipc/ShadowLayerChild.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* 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 "ShadowLayerChild.h"
+#include "Layers.h"                     // for Layer
+#include "ShadowLayers.h"               // for ShadowableLayer
+#include "nsDebug.h"                    // for NS_ABORT_IF_FALSE
+
+namespace mozilla {
+namespace layers {
+
+ShadowLayerChild::ShadowLayerChild(ShadowableLayer* aLayer)
+  : mLayer(aLayer)
+{ }
+
+ShadowLayerChild::~ShadowLayerChild()
+{ }
+
+void
+ShadowLayerChild::ActorDestroy(ActorDestroyReason why)
+{
+  NS_ABORT_IF_FALSE(AncestorDeletion != why,
+                    "shadowable layer should have been cleaned up by now");
+
+  if (AbnormalShutdown == why) {
+    // This is last-ditch emergency shutdown.  Just have the layer
+    // forget its IPDL resources; IPDL-generated code will clean up
+    // automatically in this case.
+    mLayer->AsLayer()->Disconnect();
+    mLayer = nullptr;
+  }
+}
+
+}  // namespace layers
+}  // namespace mozilla