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

remoting/protocol/client_event_dispatcher.h

Index: remoting/protocol/client_event_dispatcher.h
diff --git a/remoting/protocol/client_event_dispatcher.h b/remoting/protocol/client_event_dispatcher.h
index 6a3c54f25e354f44c4b02dac9fed46e36fb3c4cc..d9694cee38f3dabefecf4be08d6305596be6a940 100644
--- a/remoting/protocol/client_event_dispatcher.h
+++ b/remoting/protocol/client_event_dispatcher.h
@@ -24,6 +24,7 @@ class ClientEventDispatcher : public ChannelDispatcherBase, public InputStub {
   void InjectKeyEvent(const KeyEvent& event) override;
   void InjectTextEvent(const TextEvent& event) override;
   void InjectMouseEvent(const MouseEvent& event) override;
+  void InjectTouchEvent(const TouchEvent& event) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ClientEventDispatcher);