mash: Add autoclick app.

ash/autoclick/mus/public/interfaces/autoclick.mojom

+// 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.
+
+module ash.autoclick.mojom;
+
+// Used by Chrome to set the time to wait in milliseconds from when the mouse
+// stops moving to when the autoclick event is sent in accessibility_autoclick.
+interface AutoclickController {
+  SetAutoclickDelay(int32 delay_in_milliseconds);

[Tom Sepez, 2016/09/12 17:41:37]

nit: can this be unsigned, or does something like -1 have some special meaning? 

[riajiang, 2016/09/12 18:23:49]

Yes it should be uint32.

+};