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 1782f57c763c29f51504305c0b89c7a9bc374d50..61172b5eb83584d806730f1ed1d3c06608ac57a6 100644
--- a/components/password_manager/core/browser/password_manager_metrics_util.cc
+++ b/components/password_manager/core/browser/password_manager_metrics_util.cc
@@ -155,6 +155,14 @@ 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