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

ui/views/examples/examples_main.cc

Index: ui/views/examples/examples_main.cc
diff --git a/ui/views/examples/examples_main.cc b/ui/views/examples/examples_main.cc
index 62a64055bf7c5eb25518c8b52d2debe356452482..53a206ffc24c5a46318c80a0a9c9901eb6d2c125 100644
--- a/ui/views/examples/examples_main.cc
+++ b/ui/views/examples/examples_main.cc
@@ -14,6 +14,7 @@
 #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"
@@ -46,6 +47,8 @@ int main(int argc, char** argv) {
 
   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);