Add "Sign In" button to the account chooser on Mac.

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 09f21aee96c0852cf6f56fb7f018812950474206..6eb80c570bee2a571ff8645ded44a46faa44e2d0 100644
--- a/chrome/browser/ui/passwords/password_dialog_controller_impl.cc
+++ b/chrome/browser/ui/passwords/password_dialog_controller_impl.cc
@@ -84,6 +84,10 @@ PasswordDialogControllerImpl::GetAccoutChooserTitle() const {
   return result;
 }
 
+bool PasswordDialogControllerImpl::ShouldShowSignInButton() const {
+  return local_credentials_.size() == 1;
+}
+
 base::string16 PasswordDialogControllerImpl::GetAutoSigninPromoTitle() const {
   int message_id = IsSyncingAutosignSetting(profile_)
                        ? IDS_AUTO_SIGNIN_FIRST_RUN_TITLE_MANY_DEVICES
@@ -114,6 +118,16 @@ void PasswordDialogControllerImpl::OnChooseCredentials(
   delegate_->ChooseCredential(password_form, credential_type);
 }
 
+void PasswordDialogControllerImpl::OnSignInClicked() {
+  DCHECK_EQ(1u, local_credentials_.size());
+  password_manager::metrics_util::LogAccountChooserUserAction(
+      password_manager::metrics_util::ACCOUNT_CHOOSER_SIGN_IN);
+  ResetDialog();
+  delegate_->ChooseCredential(
+      *local_credentials_[0],
+      password_manager::CredentialType::CREDENTIAL_TYPE_PASSWORD);
+}
+
 void PasswordDialogControllerImpl::OnAutoSigninOK() {
   password_bubble_experiment::RecordAutoSignInPromptFirstRunExperienceWasShown(
       profile_->GetPrefs());