Move GL one-off initialization code.

ui/gl/init/gl_factory.h

 // Copyright 2016 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.
 
 #ifndef UI_GL_INIT_GL_FACTORY_H_
 #define UI_GL_INIT_GL_FACTORY_H_
 
 #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"
 
 namespace gl {
 
 class GLContext;
 class GLShareGroup;
 class GLSurface;
 
 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.
 GL_INIT_EXPORT scoped_refptr<GLContext> CreateGLContext(
     GLShareGroup* share_group,
     GLSurface* compatible_surface,
     GpuPreference gpu_preference);
 
 // Create a GL surface that renders directly to a view.
 GL_INIT_EXPORT scoped_refptr<GLSurface> CreateViewGLSurface(
     gfx::AcceleratedWidget window);
 
 #if defined(USE_OZONE)
 // Create a GL surface that renders directly into a window with surfaceless
 // semantics - there is no default framebuffer and the primary surface must
 // be presented as an overlay. If surfaceless mode is not supported or
 // enabled it will return a null pointer.
 GL_INIT_EXPORT scoped_refptr<GLSurface> CreateSurfacelessViewGLSurface(
     gfx::AcceleratedWidget window);
 #endif  // defined(USE_OZONE)
 
 // Create a GL surface used for offscreen rendering.
 GL_INIT_EXPORT scoped_refptr<GLSurface> CreateOffscreenGLSurface(
     const gfx::Size& size);
 
 }  // namespace init
 }  // namespace gl
 
 #endif  // UI_GL_INIT_GL_FACTORY_H_