Implement the spring charger replacement UI.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index fdfedefe751e97abf1dc02c787c2aa40074701a2..7573f7b7e8612027c88e81deb62c979a01808806 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -13982,6 +13982,14 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="PowerSupply.ExternalPowerSupply"
+    enum="PowerSupplyExternalPowerSupply">
+  <summary>
+    External power supply type such as MAINS_CHARGER, USB_CHARGER,
+    ORIGINAL_SPRING_CHARGER, SAFE_SPRING_CHARGER.
+  </summary>
+</histogram>
+
 <histogram name="Precache.DownloadedNonPrecache" units="bytes">
   <summary>
     The number of bytes that were downloaded over the network for HTTP/HTTPS
@@ -27891,6 +27899,14 @@ other types of suffix sets.
   <int value="2" label="Brightness Absolute"/>
 </enum>
 
+<enum name="PowerSupplyExternalPowerSupply" type="int">
+  <int value="0" label="Unknown charger"/>
+  <int value="1" label="MAINS charger"/>
+  <int value="2" label="USB Charger"/>
+  <int value="3" label="Original Spring Charger"/>
+  <int value="4" label="Safe Spring Charger"/>
+</enum>
+
 <enum name="PreconnectedNavigation" type="int">
   <int value="0" label="No recent pre-connect to the page"/>
   <int value="1" label="Page nav. preceded by a pre-connect"/>