Add palette tool/manager.

ash/common/system/chromeos/palette/palette_tool.cc

+// 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/palette_tool.h"
+
+#include "base/logging.h"
+
+namespace ash {
+
+// static
+void PaletteTool::RegisterToolInstances(PaletteToolManager* tool_manager) {}
+
+PaletteTool::PaletteTool() {}
+
+PaletteTool::~PaletteTool() {}
+
+void PaletteTool::Initialize(WmWindow* window,
+                             const ToolAction& enable_tool,
+                             const ToolAction& disable_tool) {
+  window_ = window;
+  enable_tool_ = enable_tool;
+  disable_tool_ = disable_tool;
+}
+
+void PaletteTool::OnEnable() {
+  enabled_ = true;
+}
+
+void PaletteTool::OnDisable() {
+  enabled_ = false;
+}
+
+void PaletteTool::EnableSelf() {
+  DCHECK(!enable_tool_.is_null()) << "PaletteTool was not initialized";
+
+  enable_tool_.Run(tool_id());
+}
+
+void PaletteTool::DisableSelf() {
+  DCHECK(!disable_tool_.is_null()) << "PaletteTool was not initialized";
+
+  disable_tool_.Run(tool_id());
+}
+
+}  // namespace ash