Add id properties to PointerEvent

ash/host/ash_window_tree_host_x11_unittest.cc

Index: ash/host/ash_window_tree_host_x11_unittest.cc
diff --git a/ash/host/ash_window_tree_host_x11_unittest.cc b/ash/host/ash_window_tree_host_x11_unittest.cc
index 3c26367f03187c1dd9133840c662dbd57a24532c..955e552872332d43c50990f3b5942ce171d958d0 100644
--- a/ash/host/ash_window_tree_host_x11_unittest.cc
+++ b/ash/host/ash_window_tree_host_x11_unittest.cc
@@ -33,7 +33,7 @@ class RootWindowEventHandler : public ui::EventHandler {
 
   // ui::EventHandler:
   void OnTouchEvent(ui::TouchEvent* event) override {
-    last_touch_id_ = event->touch_id();
+    last_touch_id_ = event->pointer_details().id;
     last_touch_type_ = event->type();
     last_touch_location_ = event->location();
   }