Palette tool laser prototype.

ash/common/system/chromeos/palette/tools/laser_pointer_view.h

Index: ash/common/system/chromeos/palette/tools/laser_pointer_view.h
diff --git a/ash/common/system/chromeos/palette/tools/laser_pointer_view.h b/ash/common/system/chromeos/palette/tools/laser_pointer_view.h
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+// 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_TOOLS_LASER_POINTER_VIEW_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_TOOLS_LASER_POINTER_VIEW_H_
+
+#include <memory>
+
+#include "ash/common/system/chromeos/palette/tools/laser_pointer_points.h"
+#include "base/macros.h"
+#include "ui/views/view.h"
+
+namespace gfx {
+class Point;
+}
+
+namespace views {
+class Widget;
+}
+
+namespace ash {
+
+// LaserPointerView displays the palette tool laser pointer. It draws the laser,
+// which consists of a point where the mouse cursor should be, as well as a
+// trail of lines to help users track.
+class LaserPointerView : public views::View {
+ public:
+  explicit LaserPointerView(base::TimeDelta life_duration);
+  ~LaserPointerView() override;
+
+  void AddNewPoint(const gfx::Point& new_point);
+  void Stop();
+
+ private:
+  friend class LaserPointerModeTestApi;
+
+  // view::View:
+  void OnPaint(gfx::Canvas* canvas) override;
+
+  LaserPointerPoints laser_points_;
+  std::unique_ptr<views::Widget> widget_;
+
+  DISALLOW_COPY_AND_ASSIGN(LaserPointerView);
+};
+
+}  // namespace ash
+
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_TOOLS_LASER_POINTER_VIEW_H_