Add UMA metrics to recovery component.

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 6a2c26fcc6bed77f1899a56205c5cbe18f40233b..f3bcf7da1208bc119e922df09f99953fe24651a2 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -28200,6 +28200,11 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="RecoveryComponent.Event" enum="RecoveryComponentEvent">
+  <owner>robertshield@chromium.org</owner>
+  <summary>Log each stage of a recovery component event.</summary>
+</histogram>
+
 <histogram name="Renderer.AcceleratedFixedRootBackground"
     enum="AcceleratedFixedRootBackground">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
@@ -54767,6 +54772,19 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="3" label="Show More"/>
 </enum>
 
+<enum name="RecoveryComponentEvent" type="int">
+  <int value="0" label="RunningNonElevated"/>
+  <int value="1" label="ElevationNeeded"/>
+  <int value="2" label="RunFailed"/>
+  <int value="3" label="RunSucceeded"/>
+  <int value="4" label="RunSkipped"/>
+  <int value="5" label="RunningElevated"/>
+  <int value="6" label="RunElevatedFailed"/>
+  <int value="7" label="RunElevatedSucceeded"/>
+  <int value="8" label="RunElevatedSkipped"/>
+  <int value="9" label="DownloadError"/>
+</enum>
+
 <enum name="RemotePlaybackDeviceType" type="int">
   <int value="0" label="Cast Generic Media Player"/>
   <int value="1" label="Cast YouTube Player"/>