Add a new ozone switch to enable surfaceless output mode.

ui/ozone/platform/dri/ozone_platform_gbm.cc

 // Copyright 2014 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/dri/ozone_platform_gbm.h"
 
 #include <dlfcn.h>
 #include <gbm.h>
 #include <stdlib.h>
 
 #include "base/at_exit.h"
+#include "base/command_line.h"
 #include "ui/events/ozone/device/device_manager.h"
 #include "ui/events/ozone/evdev/event_factory_evdev.h"
 #include "ui/ozone/platform/dri/cursor_factory_evdev_dri.h"
 #include "ui/ozone/platform/dri/dri_window.h"
 #include "ui/ozone/platform/dri/dri_wrapper.h"
 #include "ui/ozone/platform/dri/gbm_buffer.h"
 #include "ui/ozone/platform/dri/gbm_surface.h"
 #include "ui/ozone/platform/dri/gbm_surface_factory.h"
 #include "ui/ozone/platform/dri/gpu_platform_support_gbm.h"
 #include "ui/ozone/platform/dri/gpu_platform_support_host_gbm.h"
 #include "ui/ozone/platform/dri/scanout_buffer.h"
 #include "ui/ozone/platform/dri/screen_manager.h"
 #include "ui/ozone/platform/dri/virtual_terminal_manager.h"
 #include "ui/ozone/public/cursor_factory_ozone.h"
 #include "ui/ozone/public/gpu_platform_support.h"
 #include "ui/ozone/public/gpu_platform_support_host.h"
 #include "ui/ozone/public/ozone_platform.h"
+#include "ui/ozone/public/ozone_switches.h"
 
 #if defined(OS_CHROMEOS)
 #include "ui/ozone/common/chromeos/touchscreen_device_manager_ozone.h"
 #include "ui/ozone/platform/dri/chromeos/display_message_handler.h"
 #include "ui/ozone/platform/dri/chromeos/native_display_delegate_dri.h"
 #include "ui/ozone/platform/dri/chromeos/native_display_delegate_proxy.h"
 #endif
 
 namespace ui {
 
@@ skipping 127 matching lines @@
 
   scoped_ptr<GpuPlatformSupportGbm> gpu_platform_support_;
   scoped_ptr<GpuPlatformSupportHostGbm> gpu_platform_support_host_;
 
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformGbm);
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformGbm() {
-  return new OzonePlatformGbm(false);
-}
-OzonePlatform* CreateOzonePlatformGbmEglImage() {
-  return new OzonePlatformGbm(true);
+  CommandLine* cmd = CommandLine::ForCurrentProcess();
+  return new OzonePlatformGbm(cmd->HasSwitch(switches::kOzoneUseSurfaceless));
 }
 
 }  // namespace ui