diff -r 000000000000 -r 6474c204b198 content/canvas/src/WebGLObjectModel.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/canvas/src/WebGLObjectModel.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 "WebGLObjectModel.h"
+#include "WebGLContext.h"
+
+using namespace mozilla;
+
+WebGLContextBoundObject::WebGLContextBoundObject(WebGLContext *context) {
+    mContext = context;
+    mContextGeneration = context->Generation();
+}
+bool
+WebGLContextBoundObject::IsCompatibleWithContext(WebGLContext *other) {
+    return mContext == other &&
+        mContextGeneration == other->Generation();
+}