Record UMA histogram when Form-Not-Secure warning is shown

components/password_manager/core/browser/password_manager_metrics_util.cc

Index: components/password_manager/core/browser/password_manager_metrics_util.cc
diff --git a/components/password_manager/core/browser/password_manager_metrics_util.cc b/components/password_manager/core/browser/password_manager_metrics_util.cc
index b6996542aaff7f60fa88782b2843f7f5813db135..dae4940a2bf0e7f8b26231f41540ba8e54e50186 100644
--- a/components/password_manager/core/browser/password_manager_metrics_util.cc
+++ b/components/password_manager/core/browser/password_manager_metrics_util.cc
@@ -161,6 +161,14 @@ void LogShowedHttpNotSecureExplanation() {
       "PasswordManager_ShowedHttpNotSecureExplanation"));
 }
 
+void LogShowedFormNotSecureWarningOnCurrentNavigation() {
+  // Always record 'true': this is a counter of the number of times the warning
+  // is shown, to gather metrics such as the number of times the warning is
+  // shown per million page loads.
+  UMA_HISTOGRAM_BOOLEAN(
+      "PasswordManager.ShowedFormNotSecureWarningOnCurrentNavigation", true);
+}
+
 }  // namespace metrics_util
 
 }  // namespace password_manager