Initialize RendererSettings in ContextFactory

ui/compositor/compositor_util.h

+// Copyright 2017 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 UI_COMPOSITOR_COMPOSITOR_UTIL_H_
+#define UI_COMPOSITOR_COMPOSITOR_UTIL_H_
+
+#include <stdint.h>
+
+#include "ui/compositor/compositor_export.h"
+#include "ui/gfx/buffer_types.h"
+
+namespace cc {
+class RendererSettings;
+}
+
+namespace ui {
+
+COMPOSITOR_EXPORT cc::RendererSettings CreateRendererSettings(uint32_t (
+    *get_texture_target)(gfx::BufferFormat format, gfx::BufferUsage usage));
+
+}  // namespace ui
+
+#endif  // UI_COMPOSITOR_COMPOSITOR_UTIL_H_