Add laser pointer palette code w/o laser pointer impelmentation

ash/common/system/chromeos/palette/tools/laser_pointer_mode.cc

Index: ash/common/system/chromeos/palette/tools/laser_pointer_mode.cc
diff --git a/ash/common/system/chromeos/palette/tools/laser_pointer_mode.cc b/ash/common/system/chromeos/palette/tools/laser_pointer_mode.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6773a0abf1e72c531c7b07f690c589bc71d94c29
--- /dev/null
+++ b/ash/common/system/chromeos/palette/tools/laser_pointer_mode.cc
@@ -0,0 +1,32 @@
+// 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.
+
+#include "ash/common/system/chromeos/palette/tools/laser_pointer_mode.h"
+
+#include "ash/common/system/chromeos/palette/palette_ids.h"
+
+namespace ash {
+
+LaserPointerMode::LaserPointerMode(Delegate* delegate)
+    : CommonPaletteTool(delegate) {}
+
+LaserPointerMode::~LaserPointerMode() {}
+
+PaletteGroup LaserPointerMode::GetGroup() const {
+  return PaletteGroup::MODE;
+}
+
+PaletteToolId LaserPointerMode::GetToolId() const {
+  return PaletteToolId::LASER_POINTER;
+}
+
+gfx::VectorIconId LaserPointerMode::GetActiveTrayIcon() {
+  return gfx::VectorIconId::PALETTE_TRAY_ICON_LASER_POINTER;
+}
+
+gfx::VectorIconId LaserPointerMode::GetPaletteIconId() {
+  return gfx::VectorIconId::PALETTE_MODE_LASER_POINTER;
+}
+
+}  // namespace ash