Move GL one-off initialization code.

ui/gl/init/gl_factory.h

Index: ui/gl/init/gl_factory.h
diff --git a/ui/gl/init/gl_factory.h b/ui/gl/init/gl_factory.h
index baf2f9ca5e71fa435f2a14ead4f5be1ad9a1acf6..ed114628e1e68a016dae3f1d3b073f4aadc54270 100644
--- a/ui/gl/init/gl_factory.h
+++ b/ui/gl/init/gl_factory.h
@@ -8,6 +8,7 @@
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/native_widget_types.h"
+#include "ui/gl/gl_implementation.h"
 #include "ui/gl/gpu_preference.h"
 #include "ui/gl/init/gl_init_export.h"
 
@@ -22,6 +23,13 @@ namespace init {
 // Initialize GL bindings.
 GL_INIT_EXPORT bool InitializeGLOneOff();
 
+// Initialize GL bindings using the provided parameters. This might be required
+// for use in tests, otherwise use InitializeGLOneOff() instead.
+GL_INIT_EXPORT bool InitializeGLOneOffImplementation(GLImplementation impl,
+                                                     bool fallback_to_osmesa,
+                                                     bool gpu_service_logging,
+                                                     bool disable_gl_drawing);
+
 // Create a GL context that is compatible with the given surface. |share_group|,
 // if non-NULL, is a group of contexts which the internally created OpenGL
 // context shares textures and other resources.