diff -r 000000000000 -r 6474c204b198 gfx/gl/VBOArena.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/gl/VBOArena.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+/* -*- 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 "VBOArena.h"
+#include "GLContext.h"
+
+using namespace mozilla::gl;
+
+GLuint VBOArena::Allocate(GLContext *aGLContext)
+{
+    if (!mAvailableVBOs.size()) {
+        GLuint vbo;
+        aGLContext->fGenBuffers(1, &vbo);
+        mAllocatedVBOs.push_back(vbo);
+        return vbo;
+    }
+    GLuint vbo = mAvailableVBOs.back();
+    mAvailableVBOs.pop_back();
+    return vbo;
+}
+
+void VBOArena::Reset()
+{
+    mAvailableVBOs = mAllocatedVBOs;
+}
+
+void VBOArena::Flush(GLContext *aGLContext)
+{
+    if (mAvailableVBOs.size()) {
+#ifdef DEBUG
+        printf_stderr("VBOArena::Flush for %u VBOs\n", mAvailableVBOs.size());
+#endif
+        aGLContext->fDeleteBuffers(mAvailableVBOs.size(), &mAvailableVBOs[0]);
+    }
+}