chromeos: adds TouchDeviceServer and wires up in mushrome

ash/shell_port.h

Index: ash/shell_port.h
diff --git a/ash/shell_port.h b/ash/shell_port.h
index 375cbdbd119b6a5fe27331c431ab9c51850cc68c..a23363e6a74427508be6a5367593ed7497fa43b3 100644
--- a/ash/shell_port.h
+++ b/ash/shell_port.h
@@ -26,6 +26,7 @@ namespace display {
 class Display;
 class ManagedDisplayInfo;
 class NativeDisplayDelegate;
+class TouchTransformSetter;
 }
 
 namespace gfx {
@@ -125,6 +126,13 @@ class ASH_EXPORT ShellPort {
   // window if any, or remove modal screens on all displays.
   void OnModalWindowRemoved(aura::Window* removed);
 
+  // The return value from this is supplied to AshTouchTransformController; see
+  // it and TouchTransformSetter for details.
+  // TODO(sky): remove once simplified disable management enabled everywhere;
+  // http://crbug.com/718860.
+  virtual std::unique_ptr<display::TouchTransformSetter>
+  CreateTouchTransformDelegate() = 0;
+
   // For testing only: set simulation that a modal window is open
   void SimulateModalWindowOpenForTesting(bool modal_window_open) {
     simulate_modal_window_open_for_testing_ = modal_window_open;