Refactor context creation parameters into a struct.

ui/gl/gl_context.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.
 
 #include "ui/gl/gl_context.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/cancelable_callback.h"
@@ skipping 255 matching lines @@
     current_real_context_.Pointer()->Set(nullptr);
 }
 
 void GLContextReal::SetCurrent(GLSurface* surface) {
   GLContext::SetCurrent(surface);
   current_real_context_.Pointer()->Set(surface ? this : nullptr);
 }
 
 scoped_refptr<GLContext> InitializeGLContext(scoped_refptr<GLContext> context,
                                              GLSurface* compatible_surface,
-                                             GpuPreference gpu_preference) {
-  if (!context->Initialize(compatible_surface, gpu_preference))
+                                             const GLContextAttribs& attribs) {
+  if (!context->Initialize(compatible_surface, attribs))
     return nullptr;
   return context;
 }
 
 }  // namespace gl