Refactor context creation parameters into a struct.

ui/gl/gl_context_wgl.cc

 // Copyright (c) 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.
 
 // This file implements the GLContextWGL and PbufferGLContext classes.
 
 #include "ui/gl/gl_context_wgl.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface_wgl.h"
 
 namespace gl {
 
 GLContextWGL::GLContextWGL(GLShareGroup* share_group)
     : GLContextReal(share_group), context_(nullptr) {
 }
 
-bool GLContextWGL::Initialize(
-    GLSurface* compatible_surface, GpuPreference gpu_preference) {
+bool GLContextWGL::Initialize(GLSurface* compatible_surface,
+                              const GLContextAttribs& attribs) {
   // Get the handle of another initialized context in the share group _before_
   // setting context_. Otherwise this context will be considered initialized
   // and could potentially be returned by GetHandle.
   HGLRC share_handle = static_cast<HGLRC>(share_group()->GetHandle());
 
   HDC device_context = static_cast<HDC>(compatible_surface->GetHandle());
   bool has_wgl_create_context_arb =
       strstr(wglGetExtensionsStringARB(device_context),
              "WGL_ARB_create_context") != nullptr;
   bool create_core_profile = has_wgl_create_context_arb &&
@@ skipping 134 matching lines @@
     return GLContext::GetExtensions() + " " + extensions;
 
   return GLContext::GetExtensions();
 }
 
 GLContextWGL::~GLContextWGL() {
   Destroy();
 }
 
 }  // namespace gl