Add ink drop ripple to status tray

ash/common/system/tray/system_tray.h

Index: ash/common/system/tray/system_tray.h
diff --git a/ash/common/system/tray/system_tray.h b/ash/common/system/tray/system_tray.h
index d5c85f092c148caa25908b20bfdb8c9c5217c952..39f994b0141c623a986cab23ed17a33777eefcc8 100644
--- a/ash/common/system/tray/system_tray.h
+++ b/ash/common/system/tray/system_tray.h
@@ -172,6 +172,10 @@ class ASH_EXPORT SystemTray : public TrayBackgroundView,
   // Activates the system tray bubble.
   void ActivateBubble();
 
+ protected:
+  // Overridden from TrayBackgroundView.
+  gfx::Insets GetBackgroundInsets() const override;
+
  private:
   class ActivationObserver;
 
@@ -264,6 +268,7 @@ class ASH_EXPORT SystemTray : public TrayBackgroundView,
   bool full_system_tray_menu_;
 
   // These objects are not owned by this class.
+  TrayUser* tray_user_active_;

[bruthig, 2016/11/17 06:31:20]

Consider renaming as |active_tray_user_|.

[mohsen, 2016/11/17 20:10:12]

Not needed anymore. Removed.

   TrayAccessibility* tray_accessibility_;
   TrayAudio* tray_audio_;  // May be null.
   TrayCast* tray_cast_;