Implement the spring charger replacement UI.

ash/system/tray/system_tray_delegate.h

Index: ash/system/tray/system_tray_delegate.h
diff --git a/ash/system/tray/system_tray_delegate.h b/ash/system/tray/system_tray_delegate.h
index 3a3129dbd6ac5e366e8edc8859d0c245ca989bc2..ee325dd95ba696843b5ab585e88ab3f534b8911e 100644
--- a/ash/system/tray/system_tray_delegate.h
+++ b/ash/system/tray/system_tray_delegate.h
@@ -206,6 +206,12 @@ class ASH_EXPORT SystemTrayDelegate {
   // Shows login UI to add other users to this session.
   virtual void ShowUserLogin() = 0;
 
+  // Shows the spring charger replacement dialog if necessary.
+  virtual void ShowSpringChargerReplacementDialog() = 0;
+
+  // True if user has confirmed using safe spring charger.
+  virtual bool HasUserConfirmedSafeSpringCharger() = 0;
+
   // Attempts to shut down the system.
   virtual void ShutDown() = 0;