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

chrome/browser/ui/passwords/password_dialog_controller_impl.cc

Index: chrome/browser/ui/passwords/password_dialog_controller_impl.cc
diff --git a/chrome/browser/ui/passwords/password_dialog_controller_impl.cc b/chrome/browser/ui/passwords/password_dialog_controller_impl.cc
index 6eb80c570bee2a571ff8645ded44a46faa44e2d0..4f5084479f86c7089f534ec66bd40cf99972841d 100644
--- a/chrome/browser/ui/passwords/password_dialog_controller_impl.cc
+++ b/chrome/browser/ui/passwords/password_dialog_controller_impl.cc
@@ -113,7 +113,8 @@ void PasswordDialogControllerImpl::OnChooseCredentials(
     const autofill::PasswordForm& password_form,
     password_manager::CredentialType credential_type) {
   password_manager::metrics_util::LogAccountChooserUserAction(
-      password_manager::metrics_util::ACCOUNT_CHOOSER_CREDENTIAL_CHOSEN);
+      password_manager::metrics_util::ACCOUNT_CHOOSER_CREDENTIAL_CHOSEN,
+      local_credentials_.size() == 1);
   ResetDialog();
   delegate_->ChooseCredential(password_form, credential_type);
 }
@@ -121,7 +122,7 @@ void PasswordDialogControllerImpl::OnChooseCredentials(
 void PasswordDialogControllerImpl::OnSignInClicked() {
   DCHECK_EQ(1u, local_credentials_.size());
   password_manager::metrics_util::LogAccountChooserUserAction(
-      password_manager::metrics_util::ACCOUNT_CHOOSER_SIGN_IN);
+      password_manager::metrics_util::ACCOUNT_CHOOSER_SIGN_IN, true);
   ResetDialog();
   delegate_->ChooseCredential(
       *local_credentials_[0],
@@ -151,7 +152,8 @@ void PasswordDialogControllerImpl::OnAutoSigninTurnOff() {
 void PasswordDialogControllerImpl::OnCloseDialog() {
   if (account_chooser_dialog_) {
     password_manager::metrics_util::LogAccountChooserUserAction(
-        password_manager::metrics_util::ACCOUNT_CHOOSER_DISMISSED);
+        password_manager::metrics_util::ACCOUNT_CHOOSER_DISMISSED,
+        local_credentials_.size() == 1);
     account_chooser_dialog_ = nullptr;
   }
   if (autosignin_dialog_) {