Refactor context creation parameters into a struct.

ui/gl/init/gl_factory_mac.cc

 // 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.
 
 #include "ui/gl/init/gl_factory.h"
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/gl/gl_bindings.h"
@@ skipping 52 matching lines @@
   impls.push_back(kGLImplementationOSMesaGL);
   return impls;
 }
 
 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
   return false;
 }
 
 scoped_refptr<GLContext> CreateGLContext(GLShareGroup* share_group,
                                          GLSurface* compatible_surface,
-                                         GpuPreference gpu_preference) {
+                                         const GLContextAttribs& attribs) {
   TRACE_EVENT0("gpu", "gl::init::CreateGLContext");
   switch (GetGLImplementation()) {
     case kGLImplementationDesktopGL:
     case kGLImplementationDesktopGLCoreProfile:
     case kGLImplementationAppleGL:
       // Note that with virtualization we might still be able to make current
       // a different onscreen surface with this context later. But we should
       // always be creating the context with an offscreen surface first.
       DCHECK(compatible_surface->IsOffscreen());
       return InitializeGLContext(new GLContextCGL(share_group),
-                                 compatible_surface, gpu_preference);
+                                 compatible_surface, attribs);
     case kGLImplementationOSMesaGL:
       return InitializeGLContext(new GLContextOSMesa(share_group),
-                                 compatible_surface, gpu_preference);
+                                 compatible_surface, attribs);
     case kGLImplementationMockGL:
       return new GLContextStub(share_group);
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 scoped_refptr<GLSurface> CreateViewGLSurface(gfx::AcceleratedWidget window) {
   TRACE_EVENT0("gpu", "gl::init::CreateViewGLSurface");
@@ skipping 28 matching lines @@
     case kGLImplementationMockGL:
       return new GLSurfaceStub;
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 }  // namespace init
 }  // namespace gl