Implement the spring charger replacement UI.

ash/system/chromeos/power/power_status.cc

Index: ash/system/chromeos/power/power_status.cc
diff --git a/ash/system/chromeos/power/power_status.cc b/ash/system/chromeos/power/power_status.cc
index 6b05401891118bd8cf960948af14c78a5d5d37fc..6f4cfe6a4b8a1776d74a33c76edbd706eac4e1b1 100644
--- a/ash/system/chromeos/power/power_status.cc
+++ b/ash/system/chromeos/power/power_status.cc
@@ -188,6 +188,13 @@ bool PowerStatus::IsUsbChargerConnected() const {
       power_manager::PowerSupplyProperties_ExternalPower_USB;
 }
 
+bool PowerStatus::IsOriginalSpringChargerConnected() const {
+  // Use the hard coded enum integer value for
+  // PowerSupplyProperties_ExternalPower_ORIGINAL_SPRING_CHARGER
+  // in purpose of backport compatibility.
+  return proto_.external_power() == 3;
+}
+
 gfx::ImageSkia PowerStatus::GetBatteryImage(IconSet icon_set) const {
   gfx::Image all;
   if (IsUsbChargerConnected()) {