Add touch events to the protocol, the stub layer, and to the client plugin.

remoting/proto/internal.proto

 // Copyright (c) 2012 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.
 
 // Internal message types that should not be seen outside the protocol
 // directory.
 
 syntax = "proto2";
 
 import "control.proto";
@@ skipping 17 matching lines @@
 }
 
 // Defines an event message on the event channel.
 message EventMessage {
   // Client's timestamp used to estimate roundtrip latency.
   optional int64 timestamp = 1;
 
   optional KeyEvent key_event = 3;
   optional MouseEvent mouse_event = 4;
   optional TextEvent text_event = 5;
+  optional TouchEvent touch_event = 6;
 }