UMA stats for stylus usage

chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.cc

Index: chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.cc
diff --git a/chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.cc b/chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.cc
index 48a8707a90744feef8222a31196d507a0bc3360b..3fd4e25f5689b0e87396b6f1212593c1e40d1d5d 100644
--- a/chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.cc
+++ b/chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.cc
@@ -19,6 +19,7 @@
 #include "ash/wm/window_properties.h"
 #include "ash/wm/window_state_aura.h"
 #include "chrome/browser/ui/ash/ash_util.h"
+#include "chrome/browser/ui/ash/metrics/stylus_metrics_recorder.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_context_menu.h"
 #include "services/ui/public/cpp/property_type_converters.h"
 #include "services/ui/public/cpp/window.h"
@@ -132,6 +133,9 @@ void ChromeNativeAppWindowViewsAuraAsh::InitializeWindow(
     widget()->GetNativeWindow()->SetProperty(aura::client::kShowStateKey,
                                              create_params.state);
   }
+  widget()->GetNativeWindow()->SetProperty(
+      aura::client::kStylusWindowTypeBucket,
+      static_cast<int>(chromeos::StylusWindowType::WINDOW_TYPE_APP));
 }
 
 void ChromeNativeAppWindowViewsAuraAsh::OnBeforeWidgetInit(