diff -r 000000000000 -r 6474c204b198 gfx/gl/GLContextTypes.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/gl/GLContextTypes.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+/* -*- Mode: c++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40; -*- */
+/* 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 "GLContextTypes.h"
+#include <cstring>
+
+using namespace mozilla::gl;
+
+GLFormats::GLFormats()
+{
+    std::memset(this, 0, sizeof(GLFormats));
+}
+
+PixelBufferFormat::PixelBufferFormat()
+{
+    std::memset(this, 0, sizeof(PixelBufferFormat));
+}