Ensure GL initialization only happens once, and provide common init path

ui/views/examples/examples_main.cc

 // Copyright 2012 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/command_line.h"
 #include "base/files/file_path.h"
 #include "base/i18n/icu_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "ui/aura/env.h"
 #include "ui/base/ime/input_method_initializer.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/compositor/test/context_factories_for_test.h"
 #include "ui/gfx/screen.h"
+#include "ui/gl/gl_surface.h"
 #include "ui/views/corewm/wm_state.h"
 #include "ui/views/examples/example_base.h"
 #include "ui/views/examples/examples_window.h"
 #include "ui/views/test/desktop_test_views_delegate.h"
 
 #if !defined(OS_CHROMEOS)
 #include "ui/views/widget/desktop_aura/desktop_screen.h"
 #endif
 #if defined(OS_WIN)
 #include "ui/base/win/scoped_ole_initializer.h"
@@ skipping 12 matching lines @@
   base::i18n::InitializeICU();
 
   base::FilePath pak_dir;
   PathService::Get(base::DIR_MODULE, &pak_dir);
 
   base::FilePath pak_file;
   pak_file = pak_dir.Append(FILE_PATH_LITERAL("ui_test.pak"));
 
   ui::ResourceBundle::InitSharedInstanceWithPakPath(pak_file);
 
+  gfx::GLSurface::InitializeOneOff();
+
   // The ContextFactory must exist before any Compositors are created.
   bool allow_test_contexts = false;
   ui::InitializeContextFactoryForTests(allow_test_contexts);
 
   aura::Env::CreateInstance();
 
   ui::InitializeInputMethodForTesting();
 
   {
     views::DesktopTestViewsDelegate views_delegate;
@@ skipping 14 matching lines @@
 
     ui::ResourceBundle::CleanupSharedInstance();
   }
 
   ui::ShutdownInputMethod();
 
   aura::Env::DeleteInstance();
 
   return 0;
 }