diff -r 000000000000 -r 6474c204b198 dom/ipc/ContentProcess.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/ipc/ContentProcess.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set sw=4 ts=8 et tw=80 : 
+ * 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 dom_tabs_ContentThread_h
+#define dom_tabs_ContentThread_h 1
+
+#include "mozilla/ipc/ProcessChild.h"
+#include "mozilla/ipc/ScopedXREEmbed.h"
+#include "ContentChild.h"
+
+#undef _MOZ_LOG
+#define _MOZ_LOG(s)  printf("[ContentProcess] %s", s)
+
+namespace mozilla {
+namespace dom {
+
+/**
+ * ContentProcess is a singleton on the content process which represents
+ * the main thread where tab instances live.
+ */
+class ContentProcess : public mozilla::ipc::ProcessChild
+{
+    typedef mozilla::ipc::ProcessChild ProcessChild;
+
+public:
+    ContentProcess(ProcessHandle mParentHandle)
+        : ProcessChild(mParentHandle)
+    { }
+
+    ~ContentProcess()
+    { }
+
+    virtual bool Init() MOZ_OVERRIDE;
+    virtual void CleanUp() MOZ_OVERRIDE;
+
+    void SetAppDir(const nsACString& aPath);
+
+private:
+    ContentChild mContent;
+    mozilla::ipc::ScopedXREEmbed mXREEmbed;
+
+    DISALLOW_EVIL_CONSTRUCTORS(ContentProcess);
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // ifndef dom_tabs_ContentThread_h