Moving input device hotplug event processing outside of ui/display

ash/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
     [ rebase_path("ash.gyp") ],
@@ skipping 89 matching lines @@
       "system/tray/media_security/media_capture_observer.h",
       "system/tray/media_security/multi_profile_media_tray_item.cc",
       "system/tray/media_security/multi_profile_media_tray_item.h",
     ]
   }
 
   if (!use_x11 || !is_chromeos) {
     sources -= [
       "touch/touch_transformer_controller.cc",
       "touch/touch_transformer_controller.h",
+      "touch/touchscreen_util.cc",
+      "touch/touchscreen_util.h",
     ]
   }
 
   if (!use_ozone) {
     sources -= [
       "display/mouse_cursor_event_filter_ozone.cc",
     ]
   }
 
   if (!use_ozone) {
@@ skipping 198 matching lines @@
       "//ui/display",
       "//ui/display:test_util",
       "//ui/display/types",
       #'../chromeos/chromeos.gyp:chromeos_test_support_without_gmock',  TODO(GYP)
       #'../chromeos/chromeos.gyp:power_manager_proto',  TODO(GYP)
     ]
   } else {
     sources -= [
       "display/resolution_notification_controller_unittest.cc",
       "touch/touch_transformer_controller_unittest.cc",
+      "touch/touchscreen_util_unittest.cc",
     ]
   }
 
   # TODO(GYP) is this necessary?
   #['OS=="linux" and component=="shared_library" and use_allocator!="none"', {
   # ldflags = "-rdynamic"
 
   if (use_ozone) {
     sources -= [
       "sticky_keys/sticky_keys_unittest.cc",  # crbug.com/354035
@@ skipping 41 matching lines @@
     "//testing/gtest",
     "//ui/aaccessibility",
   ]
 
   if (is_chromeos) {
     deps += [ "//ui/display" ]
   }
 }
 
 }  # if false