chromeos: adds TouchDeviceServer and wires up in mushrome

services/ui/input_devices/input_device_server.h

Index: services/ui/input_devices/input_device_server.h
diff --git a/services/ui/input_devices/input_device_server.h b/services/ui/input_devices/input_device_server.h
index 085a7fbc6b2b604286ac79b7ea45cef75b976b0a..c64bda2e16d476d945fed5db5f769a21a722cbc7 100644
--- a/services/ui/input_devices/input_device_server.h
+++ b/services/ui/input_devices/input_device_server.h
@@ -19,6 +19,8 @@ struct BindSourceInfo;
 
 namespace ui {
 
+class TouchDeviceServer;
+
 // Listens to DeviceDataManager for updates on input-devices and forwards those
 // updates to any registered InputDeviceObserverMojo in other processes via
 // Mojo IPC. This runs in the mus-ws process.
@@ -63,6 +65,10 @@ class InputDeviceServer : public mojom::InputDeviceServer,
   // DeviceDataManager instance we are registered as an observer with.
   ui::DeviceDataManager* manager_ = nullptr;
 
+#if defined(OS_CHROMEOS)
+  std::unique_ptr<TouchDeviceServer> touch_device_server_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(InputDeviceServer);
 };