Magnifier border is now more visible on light backgrounds.

ash/common/system/chromeos/palette/tools/magnifier_mode.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_MAGNIFIER_MODE_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_MAGNIFIER_MODE_H_
+
+#include "ash/common/system/chromeos/palette/common_palette_tool.h"
+
+namespace ash {
+
+// Exposes a palette tool that lets the user enable a partial screen magnifier
+// (ie, a spyglass) that dynamically appears when pressing the screen.
+class MagnifierMode : public CommonPaletteTool {
+ public:
+  explicit MagnifierMode(Delegate* delegate);
+  ~MagnifierMode() override;
+
+ private:
+  // PaletteTool overrides.
+  PaletteGroup GetGroup() const override;
+  PaletteToolId GetToolId() const override;
+  gfx::VectorIconId GetActiveTrayIcon() override;
+  void OnEnable() override;
+  void OnDisable() override;
+  views::View* CreateView() override;
+
+  // CommonPaletteTool overrides.
+  gfx::VectorIconId GetPaletteIconId() override;
+
+  DISALLOW_COPY_AND_ASSIGN(MagnifierMode);
+};
+
+}  // namespace ash
+
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_MAGNIFIER_MODE_H_