chromeos: adds TouchDeviceServer and wires up in mushrome

ash/mus/bridge/shell_port_mash.cc

Index: ash/mus/bridge/shell_port_mash.cc
diff --git a/ash/mus/bridge/shell_port_mash.cc b/ash/mus/bridge/shell_port_mash.cc
index 5df798f1a6d2cc83e53d7536a081e3d342c47ca7..0a814dbd7dd4482a1caf26038a4fa024f6a2c8ad 100644
--- a/ash/mus/bridge/shell_port_mash.cc
+++ b/ash/mus/bridge/shell_port_mash.cc
@@ -23,6 +23,7 @@
 #include "ash/mus/drag_window_resizer.h"
 #include "ash/mus/keyboard_ui_mus.h"
 #include "ash/mus/screen_mus.h"
+#include "ash/mus/touch_transform_setter_mus.h"
 #include "ash/mus/window_manager.h"
 #include "ash/public/cpp/config.h"
 #include "ash/public/cpp/shell_window_ids.h"
@@ -268,6 +269,13 @@ void ShellPortMash::SetDisplayWorkAreaInsets(WmWindow* window,
   window_manager_->screen()->SetWorkAreaInsets(window->aura_window(), insets);
 }
 
+std::unique_ptr<display::TouchTransformSetter>
+ShellPortMash::CreateTouchTransformDelegate() {
+  std::unique_ptr<TouchTransformSetterMus> delegate =
+      base::MakeUnique<TouchTransformSetterMus>(window_manager_->connector());
+  return delegate;
+}
+
 void ShellPortMash::LockCursor() {
   window_manager_->window_manager_client()->LockCursor();
 }