diff -r 000000000000 -r 6474c204b198 content/canvas/src/WebGLExtensionCompressedTextureS3TC.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/canvas/src/WebGLExtensionCompressedTextureS3TC.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+/* 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"
+
+using namespace mozilla;
+
+WebGLExtensionCompressedTextureS3TC::WebGLExtensionCompressedTextureS3TC(WebGLContext* context)
+    : WebGLExtensionBase(context)
+{
+    context->mCompressedTextureFormats.AppendElement(LOCAL_GL_COMPRESSED_RGB_S3TC_DXT1_EXT);
+    context->mCompressedTextureFormats.AppendElement(LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT1_EXT);
+    context->mCompressedTextureFormats.AppendElement(LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT3_EXT);
+    context->mCompressedTextureFormats.AppendElement(LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT5_EXT);
+}
+
+WebGLExtensionCompressedTextureS3TC::~WebGLExtensionCompressedTextureS3TC()
+{
+}
+
+IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionCompressedTextureS3TC)