Refactor context creation parameters into a struct.

ui/gl/gl_context_stub.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_stub.h"
 
 #include "ui/gl/gl_gl_api_implementation.h"
 
 namespace gl {
 
 GLContextStub::GLContextStub() : GLContextReal(nullptr) {}
 GLContextStub::GLContextStub(GLShareGroup* share_group)
     : GLContextReal(share_group) {}
 
-bool GLContextStub::Initialize(
-    GLSurface* compatible_surface, GpuPreference gpu_preference) {
+bool GLContextStub::Initialize(GLSurface* compatible_surface,
+                               const GLContextAttribs& attribs) {
   return true;
 }
 
 bool GLContextStub::MakeCurrent(GLSurface* surface) {
   SetGLToStubGLApi();
   SetCurrent(surface);
   InitializeDynamicBindings();
   return true;
 }
 
@@ skipping 12 matching lines @@
 void GLContextStub::OnSetSwapInterval(int interval) {
 }
 
 std::string GLContextStub::GetGLRenderer() {
   return std::string("CHROMIUM");
 }
 
 GLContextStub::~GLContextStub() {}
 
 }  // namespace gl