[Ozone] Adding a software surface implementation

ui/gfx/ozone/impl/buffer_generator_ozone.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/gfx/ozone/impl/buffer_generator_ozone.h"
+
+#include "ui/gfx/ozone/impl/drm_skbitmap_ozone.h"
+
+namespace gfx {
+
+BufferGeneratorOzone::BufferGeneratorOzone() {
+}
+
+BufferGeneratorOzone::~BufferGeneratorOzone() {
+}
+
+DrmSkBitmapOzone* BufferGeneratorOzone::CreateBuffer(int fd) {
+  return new DrmSkBitmapOzone(fd);
+}
+
+}  // namespace gfx