diff -r 000000000000 -r 6474c204b198 content/canvas/src/WebGLExtensionFragDepth.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/canvas/src/WebGLExtensionFragDepth.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+/* -*- 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 "WebGLContext.h"
+#include "WebGLExtensions.h"
+#include "mozilla/dom/WebGLRenderingContextBinding.h"
+#include "GLContext.h"
+
+using namespace mozilla;
+
+WebGLExtensionFragDepth::WebGLExtensionFragDepth(WebGLContext* context)
+    : WebGLExtensionBase(context)
+{
+    MOZ_ASSERT(IsSupported(context),
+               "Should not construct extension object if unsupported.");
+}
+
+WebGLExtensionFragDepth::~WebGLExtensionFragDepth()
+{
+}
+
+bool
+WebGLExtensionFragDepth::IsSupported(const WebGLContext* context)
+{
+    gl::GLContext* gl = context->GL();
+
+    return gl->IsSupported(gl::GLFeature::frag_depth);
+}
+
+
+IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionFragDepth)