[Autofill] Log the number of profiles considered/removed during dedupe.

components/autofill/core/browser/personal_data_manager.cc

Index: components/autofill/core/browser/personal_data_manager.cc
diff --git a/components/autofill/core/browser/personal_data_manager.cc b/components/autofill/core/browser/personal_data_manager.cc
index b62cbe6d6a81afcce7d33281e8491ffd87567e64..9e9bdc6b618e21a9d0768208c2b7ec228159cd32 100644
--- a/components/autofill/core/browser/personal_data_manager.cc
+++ b/components/autofill/core/browser/personal_data_manager.cc
@@ -1560,6 +1560,8 @@ void PersonalDataManager::FindAndMergeDuplicateProfiles(
     const std::vector<AutofillProfile*>& existing_profiles,
     AutofillProfile* profile_to_merge,
     std::vector<std::string>* profile_guids_to_delete) {
+  AutofillMetrics::LogNumberOfProfilesConsideredForDedupe(
+      existing_profiles.size());
   for (AutofillProfile* existing_profile : existing_profiles) {
     // Don't try to merge a profile with itself or with any profile with a
     // different PrimaryValue.
@@ -1580,6 +1582,9 @@ void PersonalDataManager::FindAndMergeDuplicateProfiles(
       }
     }
   }
+
+  AutofillMetrics::LogNumberOfProfilesRemovedDuringDedupe(
+      profile_guids_to_delete->size());
 }
 
 }  // namespace autofill