UMA stats for stylus usage

chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h

Index: chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h
index 61a76aaa4b121608682bea2e502b59921b1f6dfe..5c91471f29348c8b1a929d5840dc4dccd1c88da4 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h
@@ -21,9 +21,14 @@
 #include "chrome/browser/ui/ash/app_sync_ui_state_observer.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
 #include "chrome/browser/ui/ash/launcher/launcher_app_updater.h"
+#include "chrome/browser/ui/ash/metrics/stylus_metrics_recorder.h"

[xiyuan, 2016/09/16 20:07:54]

forgot to remove?

[xiaoyinh(OOO Sep 11-29), 2016/09/16 22:34:25]

Oops...Removed.

 #include "components/prefs/pref_change_registrar.h"
 #include "ui/aura/window_observer.h"
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/ui/ash/metrics/stylus_metrics_recorder.h"

[xiyuan, 2016/09/16 20:07:54]

nit: Since StylusMetricsRecorder is held in a std::unique_ptr, we can forward
declare it and move the include to cc file.

[xiaoyinh(OOO Sep 11-29), 2016/09/16 22:34:25]

Done.

+#endif
+
 class AppSyncUIState;
 class BrowserStatusMonitor;
 class LauncherControllerHelper;
@@ -368,6 +373,11 @@ class ChromeLauncherControllerImpl
   typedef std::map<std::string, RunningAppListIds> RunningAppListIdMap;
   RunningAppListIdMap last_used_running_application_order_;
 
+#if defined(OS_CHROMEOS)
+  // Record stylus metrics for down event.
+  std::unique_ptr<chromeos::StylusMetricsRecorder> stylus_metrics_recorder_;
+#endif
+
   base::WeakPtrFactory<ChromeLauncherControllerImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeLauncherControllerImpl);