diff -r 000000000000 -r 6474c204b198 gfx/layers/ipc/CompositableTransactionParent.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/layers/ipc/CompositableTransactionParent.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* -*- 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/. */
+
+#ifndef MOZILLA_LAYERS_COMPOSITABLETRANSACTIONPARENT_H
+#define MOZILLA_LAYERS_COMPOSITABLETRANSACTIONPARENT_H
+
+#include <vector>                       // for vector
+#include "mozilla/Attributes.h"         // for MOZ_OVERRIDE
+#include "mozilla/layers/ISurfaceAllocator.h"  // for ISurfaceAllocator
+#include "mozilla/layers/LayersMessages.h"  // for EditReply, etc
+
+namespace mozilla {
+namespace layers {
+
+class CompositableHost;
+
+typedef std::vector<mozilla::layers::EditReply> EditReplyVector;
+
+// Since PCompositble has two potential manager protocols, we can't just call
+// the Manager() method usually generated when there's one manager protocol,
+// so both manager protocols implement this and we keep a reference to them
+// through this interface.
+class CompositableParentManager : public ISurfaceAllocator
+{
+protected:
+  /**
+   * Handle the IPDL messages that affect PCompositable actors.
+   */
+  bool ReceiveCompositableUpdate(const CompositableOperation& aEdit,
+                                 EditReplyVector& replyv);
+  bool IsOnCompositorSide() const MOZ_OVERRIDE { return true; }
+
+  /**
+   * Return true if this protocol is asynchronous with respect to the content
+   * thread (ImageBridge for instance).
+   */
+  virtual bool IsAsync() const { return false; }
+
+  void ReturnTextureDataIfNecessary(CompositableHost* aCompositable,
+                                    EditReplyVector& replyv,
+                                    PCompositableParent* aParent);
+  void ClearPrevFenceHandles();
+
+protected:
+  std::vector<FenceHandle> mPrevFenceHandles;
+};
+
+} // namespace
+} // namespace
+
+#endif