diff -r 000000000000 -r 6474c204b198 content/canvas/src/WebGLExtensionInstancedArrays.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/canvas/src/WebGLExtensionInstancedArrays.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,63 @@
+/* -*- 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;
+
+WebGLExtensionInstancedArrays::WebGLExtensionInstancedArrays(WebGLContext* context)
+  : WebGLExtensionBase(context)
+{
+    MOZ_ASSERT(IsSupported(context), "should not construct WebGLExtensionInstancedArrays: "
+                                     "ANGLE_instanced_arrays unsupported.");
+}
+
+WebGLExtensionInstancedArrays::~WebGLExtensionInstancedArrays()
+{
+}
+
+void
+WebGLExtensionInstancedArrays::DrawArraysInstancedANGLE(GLenum mode, GLint first,
+                                                        GLsizei count, GLsizei primcount)
+{
+    if (mIsLost)
+        return mContext->ErrorInvalidOperation("drawArraysInstancedANGLE: Extension is lost.");
+
+    mContext->DrawArraysInstanced(mode, first, count, primcount);
+}
+
+void
+WebGLExtensionInstancedArrays::DrawElementsInstancedANGLE(GLenum mode, GLsizei count,
+                                                          GLenum type, WebGLintptr offset,
+                                                          GLsizei primcount)
+{
+    if (mIsLost)
+        return mContext->ErrorInvalidOperation("drawElementsInstancedANGLE: Extension is lost.");
+
+    mContext->DrawElementsInstanced(mode, count, type, offset, primcount);
+}
+
+void
+WebGLExtensionInstancedArrays::VertexAttribDivisorANGLE(GLuint index, GLuint divisor)
+{
+    if (mIsLost)
+        return mContext->ErrorInvalidOperation("vertexAttribDivisorANGLE: Extension is lost.");
+
+    mContext->VertexAttribDivisor(index, divisor);
+}
+
+bool
+WebGLExtensionInstancedArrays::IsSupported(const WebGLContext* context)
+{
+    gl::GLContext* gl = context->GL();
+
+    return gl->IsSupported(gl::GLFeature::draw_instanced) &&
+           gl->IsSupported(gl::GLFeature::instanced_arrays);
+}
+
+IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionInstancedArrays)