Add palette tool/manager.

ash/common/system/chromeos/palette/palette_ids.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 ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_PALETTE_IDS_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_PALETTE_IDS_H_
+
+#include <string>
+
+#include "ash/ash_export.h"
+
+namespace ash {
+
+// Palette tools are grouped into different categories. Each tool corresponds to
+// exactly one group, and at most one tool can be active per group. Actions are
+// actions the user wants to do, such as take a screenshot, and modes generally
+// change OS behavior, like showing a laser pointer instead of a cursor.
+enum class PaletteGroup { ACTION, MODE };
+
+enum class PaletteToolId {
+  NONE,
+  CREATE_NOTE,
+  CAPTURE_REGION,
+  CAPTURE_SCREEN,
+  LASER_POINTER,
+  MAGNIFY,
+};
+
+// Helper functions that convert PaletteToolIds and PaletteGroups to strings.
+ASH_EXPORT std::string PaletteToolIdToString(PaletteToolId tool_id);
+ASH_EXPORT std::string PaletteGroupToString(PaletteGroup group);
+
+}  // namespace ash
+
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_PALETTE_IDS_H_