Move touchscreen_util.cc/h from ash to ui.

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index 1f087c8e36f8549fd2852d42e25851513dd7aa33..48ff86015374d303939422f2fc8ffb23011407de 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -756,8 +756,6 @@ component("ash") {
     "touch/touch_transformer_controller.h",
     "touch/touch_uma.cc",
     "touch/touch_uma.h",
-    "touch/touchscreen_util.cc",
-    "touch/touchscreen_util.h",
     "utility/screenshot_controller.cc",
     "utility/screenshot_controller.h",
     "virtual_keyboard_controller.cc",
@@ -990,8 +988,6 @@ component("ash") {
       "display/resolution_notification_controller.h",
       "touch/touch_transformer_controller.cc",
       "touch/touch_transformer_controller.h",
-      "touch/touchscreen_util.cc",
-      "touch/touchscreen_util.h",
       "virtual_keyboard_controller.cc",
       "virtual_keyboard_controller.h",
     ]
@@ -1316,7 +1312,6 @@ test("ash_unittests") {
     "tooltips/tooltip_controller_unittest.cc",
     "touch/touch_observer_hud_unittest.cc",
     "touch/touch_transformer_controller_unittest.cc",
-    "touch/touchscreen_util_unittest.cc",
     "utility/screenshot_controller_unittest.cc",
     "virtual_keyboard_controller_unittest.cc",
     "wm/always_on_top_controller_unittest.cc",
@@ -1456,7 +1451,6 @@ test("ash_unittests") {
       "magnifier/magnification_controller_unittest.cc",
       "sticky_keys/sticky_keys_overlay_unittest.cc",
       "sticky_keys/sticky_keys_unittest.cc",
-      "touch/touchscreen_util_unittest.cc",
       "virtual_keyboard_controller_unittest.cc",
 
       # All tests for multiple displays: not supported on Windows Ash.