ozone: Initialize a subsystem only if necessary.

ui/ozone/platform/egltest/ozone_platform_egltest.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/egltest/ozone_platform_egltest.h"
 
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
@@ skipping 251 matching lines @@
   InputMethodContextFactoryOzone input_method_context_factory_ozone_;
   CursorFactoryOzone cursor_factory_ozone_;
 
   bool shim_initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformEgltest);
 };
 
 }  // namespace
 
-OzonePlatform* CreateOzonePlatformEgltest() {
+OzonePlatform* CreateOzonePlatformEgltestForUI() {
   OzonePlatformEgltest* platform = new OzonePlatformEgltest;
   platform->Initialize();
   return platform;
 }
 
+OzonePlatform* CreateOzonePlatformEgltestForGPU() {
+  return NULL;
+}
+
 }  // namespace ui