[iOS][Safety Check] Add password check referrer recording

Add referrer recording for the password check issues page

Bug: 1078782
Change-Id: Ie7ca81d5283fc77813864b21c8439acbafadf2fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485160Reviewed-by: Viktor Semeniuk <vsemeniuk@google.com>
Commit-Queue: Sean Harrison <harrisonsean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818855}

ios/chrome/browser/ui/settings/safety_check/safety_check_mediator.mm

@@ -14,6 +14,7 @@
 #include "base/time/time.h"
 #include "base/version.h"
 #include "components/password_manager/core/browser/leak_detection_dialog_utils.h"
+#include "components/password_manager/core/browser/ui/password_check_referrer.h"
 #include "components/password_manager/core/common/password_manager_features.h"
 #include "components/prefs/pref_service.h"
 #include "components/safe_browsing/core/common/safe_browsing_prefs.h"
@@ -373,6 +374,8 @@ constexpr double kSafeBrowsingRowMinDelay = 1.75;
           base::UmaHistogramEnumeration(
               kSafetyCheckInteractions,
               SafetyCheckInteractions::kPasswordsManage);
+          password_manager::LogPasswordCheckReferrer(
+              password_manager::PasswordCheckReferrer::kSafetyCheck);
           [self.handler showPasswordIssuesPage];
           break;
       }