Refactor MdFocusRing to make it easier to reuse on other controls.

ui/views/controls/focus_ring.h

Index: ui/views/controls/focus_ring.h
diff --git a/ui/views/controls/focus_ring.h b/ui/views/controls/focus_ring.h
new file mode 100644
index 0000000000000000000000000000000000000000..1c2c74c049e7dc0c2a18a0ec69d7f64cdf224647
--- /dev/null
+++ b/ui/views/controls/focus_ring.h
@@ -0,0 +1,26 @@
+// 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.
+

[sky, 2016/10/03 23:53:15]

Don't forget header guards.

[Evan Stade, 2016/10/04 01:04:55]

Done.

+#include "ui/views/view.h"
+
+namespace views {
+
+// FocusRing is a View that is designed to act as an indicator of focus for its
+// parent. It is a stand-alone view that paints to a layer which extends beyond
+// the bounds of its parent view.
+class FocusRing : public View {
+ public:
+  FocusRing();
+  ~FocusRing() override;
+
+  // View:
+  bool CanProcessEventsWithinSubtree() const override;
+  void Layout() override;
+  void OnPaint(gfx::Canvas* canvas) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(FocusRing);
+};
+
+}  // views