Support focus highlight in Android window

components/arc/common/focus_highlight.mojom

Index: components/arc/common/focus_highlight.mojom
diff --git a/components/arc/common/focus_highlight.mojom b/components/arc/common/focus_highlight.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..6cda7fd93927f921b40a9b843e1ac29372f095bd
--- /dev/null
+++ b/components/arc/common/focus_highlight.mojom
@@ -0,0 +1,19 @@
+// 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.
+
+// Next MinVersion: 1
+
+module arc.mojom;
+
+import "screen_rect.mojom";
+
+// Next method ID: 1
+interface FocusHighlightHost {
+  OnViewFocused@0(ScreenRect rect);
+};
+
+// Next method ID: 1
+interface FocusHighlightInstance {
+  Init@0(FocusHighlightHost host);
+};