Componentize about_flags::FeatureEntry in flags_ui component.

components/flags_ui/feature_entry_macros.h

+// Copyright 2015 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 COMPONENTS_FLAGS_UI_FEATURE_ENTRY_MACROS_H_
+#define COMPONENTS_FLAGS_UI_FEATURE_ENTRY_MACROS_H_
+
+// Macros to simplify specifying the type of FeatureEntry. Please refer to
+// the comments on FeatureEntry::Type in feature_entry.h, which explain the
+// different entry types and when they should be used.
+#define SINGLE_VALUE_TYPE_AND_VALUE(command_line_switch, switch_value)     \
+  flags_ui::FeatureEntry::SINGLE_VALUE, command_line_switch, switch_value, \
+      nullptr, nullptr, nullptr, nullptr, 0
+#define SINGLE_VALUE_TYPE(command_line_switch) \
+  SINGLE_VALUE_TYPE_AND_VALUE(command_line_switch, "")
+#define SINGLE_DISABLE_VALUE_TYPE_AND_VALUE(command_line_switch, switch_value) \
+  flags_ui::FeatureEntry::SINGLE_DISABLE_VALUE, command_line_switch,           \
+      switch_value, nullptr, nullptr, nullptr, nullptr, 0
+#define SINGLE_DISABLE_VALUE_TYPE(command_line_switch) \
+  SINGLE_DISABLE_VALUE_TYPE_AND_VALUE(command_line_switch, "")
+#define ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(enable_switch, enable_value,     \
+                                            disable_switch, disable_value)   \
+  flags_ui::FeatureEntry::ENABLE_DISABLE_VALUE, enable_switch, enable_value, \
+      disable_switch, disable_value, nullptr, nullptr, 3
+#define ENABLE_DISABLE_VALUE_TYPE(enable_switch, disable_switch) \
+  ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(enable_switch, "", disable_switch, "")
+#define MULTI_VALUE_TYPE(choices)                                          \
+  flags_ui::FeatureEntry::MULTI_VALUE, nullptr, nullptr, nullptr, nullptr, \
+      nullptr, choices, arraysize(choices)
+#define FEATURE_VALUE_TYPE(feature)                                          \
+  flags_ui::FeatureEntry::FEATURE_VALUE, nullptr, nullptr, nullptr, nullptr, \
+      &feature, nullptr, 3
+
+#endif  // COMPONENTS_FLAGS_UI_FEATURE_ENTRY_MACROS_H_