Add separate UMA histograms for the account chooser with 1/many accounts.

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 8b7320d0261f35d139892060f7fc5ff59928bcd6..80cb5b39d55532eddaaddb9faf5bae6bf61dc8c8 100644
--- a/components/password_manager/core/browser/password_manager_metrics_util.cc
+++ b/components/password_manager/core/browser/password_manager_metrics_util.cc
@@ -88,7 +88,19 @@ void LogAutoSigninPromoUserAction(AutoSigninPromoUserAction action) {
                             AUTO_SIGNIN_PROMO_ACTION_COUNT);
 }
 
-void LogAccountChooserUserAction(AccountChooserUserAction action) {
+void LogAccountChooserUserActionOneAccount(AccountChooserUserAction action) {
+  UMA_HISTOGRAM_ENUMERATION("PasswordManager.AccountChooserDialogOneAccount",
+                            action, ACCOUNT_CHOOSER_ACTION_COUNT);
+  // TODO(vasilii): deprecate the histogram when the new ones hit the Stable.
+  UMA_HISTOGRAM_ENUMERATION("PasswordManager.AccountChooserDialog", action,
+                            ACCOUNT_CHOOSER_ACTION_COUNT);
+}
+
+void LogAccountChooserUserActionManyAccounts(AccountChooserUserAction action) {
+  UMA_HISTOGRAM_ENUMERATION(
+      "PasswordManager.AccountChooserDialogMultipleAccounts", action,
+      ACCOUNT_CHOOSER_ACTION_COUNT);
+  // TODO(vasilii): deprecate the histogram when the new ones hit the Stable.
   UMA_HISTOGRAM_ENUMERATION("PasswordManager.AccountChooserDialog", action,
                             ACCOUNT_CHOOSER_ACTION_COUNT);
 }