diff -r 000000000000 -r 6474c204b198 content/canvas/src/WebGLFramebufferAttachable.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/canvas/src/WebGLFramebufferAttachable.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 4; 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/. */
+
+#ifndef WEBGLFRAMEBUFFERATTACHABLE_H_
+#define WEBGLFRAMEBUFFERATTACHABLE_H_
+
+#include "GLDefs.h"
+#include "mozilla/Vector.h"
+
+namespace mozilla {
+
+class WebGLFramebuffer;
+
+class WebGLFramebufferAttachable
+{
+    struct AttachmentPoint
+    {
+        AttachmentPoint(const WebGLFramebuffer* fb, GLenum attachment)
+            : mFB(fb)
+            , mAttachment(attachment)
+        {}
+
+        const WebGLFramebuffer* mFB;
+        GLenum mAttachment;
+    };
+
+    Vector<AttachmentPoint> mAttachmentPoints;
+
+    AttachmentPoint* Contains(const WebGLFramebuffer* fb, GLenum attachment);
+
+public:
+
+    // Track FBO/Attachment combinations
+    void AttachTo(WebGLFramebuffer* fb, GLenum attachment);
+    void DetachFrom(WebGLFramebuffer* fb, GLenum attachment);
+    void NotifyFBsStatusChanged();
+};
+
+} // namespace mozilla
+
+#endif // !WEBGLFRAMEBUFFERATTACHABLE_H_