diff -r 000000000000 -r 6474c204b198 gfx/layers/ipc/LayerTransactionChild.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/layers/ipc/LayerTransactionChild.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,113 @@
+/* -*- 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 "LayerTransactionChild.h"
+#include "mozilla/layers/CompositableClient.h"  // for CompositableChild
+#include "mozilla/layers/LayersSurfaces.h"  // for PGrallocBufferChild
+#include "mozilla/layers/PCompositableChild.h"  // for PCompositableChild
+#include "mozilla/layers/PLayerChild.h"  // for PLayerChild
+#include "mozilla/mozalloc.h"           // for operator delete, etc
+#include "nsDebug.h"                    // for NS_RUNTIMEABORT, etc
+#include "nsTArray.h"                   // for nsTArray
+#include "mozilla/layers/TextureClient.h"
+
+namespace mozilla {
+namespace layers {
+
+class PGrallocBufferChild;
+
+void
+LayerTransactionChild::Destroy()
+{
+  NS_ABORT_IF_FALSE(0 == ManagedPLayerChild().Length(),
+                    "layers should have been cleaned up by now");
+  PLayerTransactionChild::Send__delete__(this);
+  // WARNING: |this| has gone to the great heap in the sky
+}
+
+PGrallocBufferChild*
+LayerTransactionChild::AllocPGrallocBufferChild(const IntSize&,
+                                                const uint32_t&,
+                                                const uint32_t&,
+                                                MaybeMagicGrallocBufferHandle*)
+{
+#ifdef MOZ_HAVE_SURFACEDESCRIPTORGRALLOC
+  return GrallocBufferActor::Create();
+#else
+  NS_RUNTIMEABORT("No gralloc buffers for you");
+  return nullptr;
+#endif
+}
+
+bool
+LayerTransactionChild::DeallocPGrallocBufferChild(PGrallocBufferChild* actor)
+{
+#ifdef MOZ_HAVE_SURFACEDESCRIPTORGRALLOC
+  delete actor;
+  return true;
+#else
+  NS_RUNTIMEABORT("Um, how did we get here?");
+  return false;
+#endif
+}
+
+PLayerChild*
+LayerTransactionChild::AllocPLayerChild()
+{
+  // we always use the "power-user" ctor
+  NS_RUNTIMEABORT("not reached");
+  return nullptr;
+}
+
+bool
+LayerTransactionChild::DeallocPLayerChild(PLayerChild* actor)
+{
+  delete actor;
+  return true;
+}
+
+PCompositableChild*
+LayerTransactionChild::AllocPCompositableChild(const TextureInfo& aInfo)
+{
+  return CompositableClient::CreateIPDLActor();
+}
+
+bool
+LayerTransactionChild::DeallocPCompositableChild(PCompositableChild* actor)
+{
+  return CompositableClient::DestroyIPDLActor(actor);
+}
+
+void
+LayerTransactionChild::ActorDestroy(ActorDestroyReason why)
+{
+#ifdef MOZ_B2G
+  // Due to poor lifetime management of gralloc (and possibly shmems) we will
+  // crash at some point in the future when we get destroyed due to abnormal
+  // shutdown. Its better just to crash here. On desktop though, we have a chance
+  // of recovering.
+  if (why == AbnormalShutdown) {
+    NS_RUNTIMEABORT("ActorDestroy by IPC channel failure at LayerTransactionChild");
+  }
+#endif
+}
+
+PTextureChild*
+LayerTransactionChild::AllocPTextureChild(const SurfaceDescriptor&,
+                                          const TextureFlags&)
+{
+  return TextureClient::CreateIPDLActor();
+}
+
+bool
+LayerTransactionChild::DeallocPTextureChild(PTextureChild* actor)
+{
+  return TextureClient::DestroyIPDLActor(actor);
+}
+
+}  // namespace layers
+}  // namespace mozilla