Refactor context creation parameters into a struct.

gpu/command_buffer/service/service_utils.h

+// Copyright (c) 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 GPU_COMMAND_BUFFER_SERVICE_SERVICE_UTILS_H_
+#define GPU_COMMAND_BUFFER_SERVICE_SERVICE_UTILS_H_
+
+#include "gpu/gpu_export.h"
+#include "ui/gl/gl_context.h"
+
+namespace gpu {
+struct GpuPreferences;
+
+namespace gles2 {
+struct ContextCreationAttribHelper;
+
+GPU_EXPORT gl::GLContextAttribs GenerateGLContextAttribs(
+    const ContextCreationAttribHelper& attribs_helper,
+    const GpuPreferences& gpu_preferences);
+
+}  // namespace gles2
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_SERVICE_UTILS_H_