UMA stats for stylus usage

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index 7a5f5298c92825b991705b6d1e586e77113eacda..d1bd3c63994496df5f4b68152d7c65ae35113f97 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -658,6 +658,8 @@ component("ash") {
     "magnifier/magnification_controller.h",
     "metrics/desktop_task_switch_metric_recorder.cc",
     "metrics/desktop_task_switch_metric_recorder.h",
+    "metrics/pointer_metrics_recorder.cc",
+    "metrics/pointer_metrics_recorder.h",
     "metrics/task_switch_metrics_recorder.cc",
     "metrics/task_switch_metrics_recorder.h",
     "metrics/task_switch_time_tracker.cc",
@@ -784,8 +786,6 @@ component("ash") {
     "wm/session_state_animator_impl.h",
     "wm/stacking_controller.cc",
     "wm/stacking_controller.h",
-    "wm/stylus_metrics_recorder.cc",
-    "wm/stylus_metrics_recorder.h",
     "wm/system_gesture_event_filter.cc",
     "wm/system_gesture_event_filter.h",
     "wm/system_modal_container_event_filter.cc",
@@ -820,6 +820,7 @@ component("ash") {
     "//ash/common/strings",
     "//ash/resources",
     "//ash/resources/vector_icons",
+    "//ash/shared:app_types",
   ]
   deps = [
     "//ash/autoclick/common:autoclick",
@@ -946,14 +947,14 @@ component("ash") {
       "accelerators/spoken_feedback_toggler.h",
       "display/resolution_notification_controller.cc",
       "display/resolution_notification_controller.h",
+      "metrics/pointer_metrics_recorder.cc",
+      "metrics/pointer_metrics_recorder.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",
-      "wm/stylus_metrics_recorder.cc",
-      "wm/stylus_metrics_recorder.h",
     ]
   }
 
@@ -1436,6 +1437,7 @@ test("ash_unittests") {
     "host/ash_window_tree_host_x11_unittest.cc",
     "magnifier/magnification_controller_unittest.cc",
     "metrics/desktop_task_switch_metric_recorder_unittest.cc",
+    "metrics/pointer_metrics_recorder_unittest.cc",
     "metrics/task_switch_metrics_recorder_unittest.cc",
     "metrics/task_switch_time_tracker_unittest.cc",
     "metrics/user_metrics_recorder_unittest.cc",
@@ -1599,6 +1601,7 @@ test("ash_unittests") {
       # TODO(zork): fix this test to build on Windows. See: crosbug.com/26906
       "focus_cycler_unittest.cc",
       "magnifier/magnification_controller_unittest.cc",
+      "metrics/pointer_metrics_recorder_unittest.cc",
       "sticky_keys/sticky_keys_overlay_unittest.cc",
       "sticky_keys/sticky_keys_unittest.cc",
       "touch/touchscreen_util_unittest.cc",