Revert of ozone: Remove the "drm" software composited platform

ui/ozone/platform/drm/common/client_native_pixmap_factory_drm.cc

Index: ui/ozone/platform/drm/common/client_native_pixmap_factory_drm.cc
diff --git a/ui/ozone/platform/drm/common/client_native_pixmap_factory_drm.cc b/ui/ozone/platform/drm/common/client_native_pixmap_factory_drm.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4b227295a2a0afb87562adfbcc584ba0075bb698
--- /dev/null
+++ b/ui/ozone/platform/drm/common/client_native_pixmap_factory_drm.cc
@@ -0,0 +1,19 @@
+// Copyright 2015 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/ozone/platform/drm/common/client_native_pixmap_factory_drm.h"
+
+#include "ui/ozone/common/stub_client_native_pixmap_factory.h"
+
+namespace ui {
+
+ClientNativePixmapFactory* CreateClientNativePixmapFactoryDri() {
+  return CreateStubClientNativePixmapFactory();
+}
+
+ClientNativePixmapFactory* CreateClientNativePixmapFactoryDrm() {
+  return CreateStubClientNativePixmapFactory();
+}
+
+}  // namespace ui