More POSIX support for Chromium, consisting mostly of broadening ifdefs. This

gpu/gles2_conform_support/native/main.cc

 // Copyright (c) 2011 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 "base/at_exit.h"
 #include "base/message_loop.h"
 
-#if defined(OS_LINUX)
+#if defined(TOOLKIT_USES_GTK)
 #include <gtk/gtk.h>
-#endif  // OS_LINUX
+#endif
 
 extern "C" {
 #if defined(GLES2_CONFORM_SUPPORT_ONLY)
 #include "gpu/gles2_conform_support/gtf/gtf_stubs.h"
 #else
 #include "third_party/gles2_conform/GTF_ES/glsl/GTF/Source/GTFMain.h"
 #endif
 }
 
 int main(int argc, char *argv[]) {
-#if defined(OS_LINUX)
+#if defined(TOOLKIT_USES_GTK)
   gtk_init(&argc, &argv);
-#endif  // OS_LINUX
+#endif
 
   base::AtExitManager at_exit;
   MessageLoopForUI message_loop;
 
   GTFMain(argc, argv);
 
   return 0;
 }