Add a feature to display a persistence toggle for permission prompts on Android.

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 7dd4a3842746ee713a6c2e134eb3d2656a10f118..de1044fa1a0fbd7ee4ccdc54a9bf85d0fa43085b 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -39505,6 +39505,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Permissions.Prompt.Denied.Persisted" enum="BooleanEnabled">
+  <owner>dominickn@chromium.org</owner>
+  <summary>
+    For each denied permission prompt displayed with a persistence toggle
+    (remember my decision), records whether the persistence toggle was enabled
+    (persist) or not enabled (don't persist).
+  </summary>
+</histogram>
+
+<histogram name="Permissions.Prompt.Granted.Persisted" enum="BooleanEnabled">
+  <owner>dominickn@chromium.org</owner>
+  <summary>
+    For each granted permission prompt displayed with a persistence toggle
+    (remember my decision), records whether the persistence toggle was enabled
+    (persist) or not enabled (don't persist).
+  </summary>
+</histogram>
+
 <histogram name="Permissions.Prompt.MergedBubbleAccepted"
     enum="PermissionRequestType">
   <owner>benwells@chromium.org</owner>
@@ -100484,6 +100502,8 @@ To add a new entry, add it with any value and run test to compute valid value.
   <affected-histogram name="Permissions.Action"/>
   <affected-histogram name="Permissions.Action.InsecureOrigin"/>
   <affected-histogram name="Permissions.Action.SecureOrigin"/>
+  <affected-histogram name="Permissions.Prompt.Denied.Persisted"/>
+  <affected-histogram name="Permissions.Prompt.Granted.Persisted"/>
   <affected-histogram name="Permissions.Requested.CrossOrigin"/>
 </histogram_suffixes>