Refactor renderer LayerTreeSettings generating code to common.

content/common/layer_tree_settings_factory.h

+// 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.
+
+#ifndef CONTENT_COMMON_LAYER_TREE_SETTINGS_FACTORY_H_
+#define CONTENT_COMMON_LAYER_TREE_SETTINGS_FACTORY_H_
+
+#include "base/command_line.h"
+#include "base/macros.h"
+#include "cc/trees/layer_tree_settings.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+// LayerTreeSettingsFactory holds utilities functions to generate
+// LayerTreeSettings.
+class CONTENT_EXPORT LayerTreeSettingsFactory {
+  // TODO(xingliu): Refactor LayerTreeSettings generation logic.
+  // crbug.com/577985
+ public:
+  static void SetTopControlsSettings(cc::LayerTreeSettings& settings,
+                                     const base::CommandLine& command_line);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_LAYER_TREE_SETTINGS_FACTORY_H_