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

chrome/browser/ui/passwords/password_dialog_controller_impl.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_PASSWORDS_PASSWORD_DIALOG_CONTROLLER_IMPL_H_
 #define CHROME_BROWSER_UI_PASSWORDS_PASSWORD_DIALOG_CONTROLLER_IMPL_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 19 matching lines @@
 
   // Pop up the autosignin first run dialog.
   void ShowAutosigninPrompt(AutoSigninFirstRunPrompt* dialog);
 
   bool IsShowingAccountChooser() const { return !!account_chooser_dialog_; }
 
   // PasswordDialogController:
   const FormsVector& GetLocalForms() const override;
   const FormsVector& GetFederationsForms() const override;
   std::pair<base::string16, gfx::Range> GetAccoutChooserTitle() const override;
+  bool ShouldShowSignInButton() const override;
   base::string16 GetAutoSigninPromoTitle() const override;
   std::pair<base::string16, gfx::Range> GetAutoSigninText() const override;
   void OnSmartLockLinkClicked() override;
   void OnChooseCredentials(
       const autofill::PasswordForm& password_form,
       password_manager::CredentialType credential_type) override;
+  void OnSignInClicked() override;
   void OnAutoSigninOK() override;
   void OnAutoSigninTurnOff() override;
   void OnCloseDialog() override;
 
  private:
   // Release |current_dialog_| and close the open dialog.
   void ResetDialog();
 
   Profile* const profile_;
   PasswordsModelDelegate* const delegate_;
   AccountChooserPrompt* account_chooser_dialog_;
   AutoSigninFirstRunPrompt* autosignin_dialog_;
   std::vector<std::unique_ptr<autofill::PasswordForm>> local_credentials_;
   std::vector<std::unique_ptr<autofill::PasswordForm>> federated_credentials_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordDialogControllerImpl);
 };
 
 #endif  // CHROME_BROWSER_UI_PASSWORDS_PASSWORD_DIALOG_CONTROLLER_IMPL_H_