Revert of Refactor context creation parameters into a struct.

ui/ozone/public/gl_ozone.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_OZONE_PUBLIC_GL_OZONE_H_
 #define UI_OZONE_PUBLIC_GL_OZONE_H_
 
 #include "base/macros.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/ozone/ozone_base_export.h"
 
 namespace gl {
 class GLContext;
-struct GLContextAttribs;
 class GLShareGroup;
 class GLSurface;
 }
 
 namespace ui {
 
 // Interface that has all of the required methods for an Ozone platform to
 // implement a GL implementation. Functions in gl_factory.h and gl_initializer.h
 // will delegate to functions in this interface.
 class OZONE_BASE_EXPORT GLOzone {
@@ skipping 17 matching lines @@
   // EGL, GLX, WGL). Returns true if the information was retrieved successfully.
   virtual bool GetGLWindowSystemBindingInfo(
       gl::GLWindowSystemBindingInfo* info) = 0;
 
   // Creates a GL context that is compatible with the given surface.
   // |share_group|, if not null, is a group of contexts which the internally
   // created OpenGL context shares textures and other resources.
   virtual scoped_refptr<gl::GLContext> CreateGLContext(
       gl::GLShareGroup* share_group,
       gl::GLSurface* compatible_surface,
-      const gl::GLContextAttribs& attribs) = 0;
+      gl::GpuPreference gpu_preference) = 0;
 
   // Creates a GL surface that renders directly to a view.
   virtual scoped_refptr<gl::GLSurface> CreateViewGLSurface(
       gfx::AcceleratedWidget window) = 0;
 
   // Creates a GL surface that renders directly into a window with surfaceless
   // semantics. The surface is not backed by any buffers and is used for
   // overlay-only displays. This will return null if surfaceless mode is
   // unsupported.
   virtual scoped_refptr<gl::GLSurface> CreateSurfacelessViewGLSurface(
       gfx::AcceleratedWidget window) = 0;
 
   // Creates a GL surface used for offscreen rendering.
   virtual scoped_refptr<gl::GLSurface> CreateOffscreenGLSurface(
       const gfx::Size& size) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_GL_OZONE_H_