UMA stats for stylus usage

chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc

Index: chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc
diff --git a/chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc b/chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc
index eb5a600576234ab8e1fd1e5c0e53093f4203743d..a06f4ffa1fb2555eb3ced3a575310b3cc178d75e 100644
--- a/chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc
+++ b/chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc
@@ -14,6 +14,7 @@
 #include "ash/common/wm_window_property.h"
 #include "ash/display/display_manager.h"
 #include "ash/display/screen_orientation_controller_chromeos.h"
+#include "ash/shared/app_types.h"
 #include "ash/shell.h"
 #include "ash/wm/window_state_aura.h"
 #include "ash/wm/window_util.h"
@@ -385,6 +386,9 @@ void ArcAppWindowLauncherController::AttachControllerToWindowIfNeeded(
   if (GetAppWindowForTask(task_id))
     return;
 
+  window->SetProperty(aura::client::kAppType,
+                      static_cast<int>(ash::AppType::ARC_APP));
+
   // Create controller if we have task info.
   TaskIdToShelfAppIdMap::iterator it = task_id_to_shelf_app_id_.find(task_id);
   if (it == task_id_to_shelf_app_id_.end())