Moving input device hotplug event processing outside of ui/display

ui/events/touchscreen_device.cc

Index: ui/events/touchscreen_device.cc
diff --git a/ui/display/types/chromeos/touchscreen_device.cc b/ui/events/touchscreen_device.cc
similarity index 72%
rename from ui/display/types/chromeos/touchscreen_device.cc
rename to ui/events/touchscreen_device.cc
index 09ee885337a3e45f27da5e22737862843f60231e..49ccdebe855c8bbce16aacbcf739bd8006fe469f 100644
--- a/ui/display/types/chromeos/touchscreen_device.cc
+++ b/ui/events/touchscreen_device.cc
@@ -2,13 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/display/types/chromeos/touchscreen_device.h"
+#include "ui/events/touchscreen_device.h"
 
 namespace ui {
 
-// static
-const int TouchscreenDevice::kInvalidId = 0;
-
 TouchscreenDevice::TouchscreenDevice(int id, const gfx::Size& size)
     : id(id),
       size(size) {}