Implemented event-dispatching for button clicks.

chrome/browser/chromeos/login/screens/eula_screen.h

 // Copyright (c) 2012 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_CHROMEOS_LOGIN_SCREENS_EULA_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_EULA_SCREEN_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 21 matching lines @@
   EulaScreen(BaseScreenDelegate* base_screen_delegate,
              Delegate* delegate,
              EulaView* view);
   virtual ~EulaScreen();
 
   // EulaModel implementation:
   virtual void PrepareToShow() override;
   virtual void Show() override;
   virtual void Hide() override;
   virtual GURL GetOemEulaUrl() const override;
-  virtual void OnAcceptButtonClicked() override;
-  virtual void OnBackButtonClicked() override;
   virtual void InitiatePasswordFetch() override;
   virtual bool IsUsageStatsEnabled() const override;
   virtual void OnViewDestroyed(EulaView* view) override;
+  virtual void OnButtonClicked(const std::string& button_id) override;
   virtual void OnContextKeyUpdated(
       const ::login::ScreenContext::KeyType& key) override;
 
   // TpmPasswordFetcherDelegate implementation:
   virtual void OnPasswordFetched(const std::string& tpm_password) override;
 
  private:
   // URL of the OEM EULA page (on disk).
   GURL oem_eula_page_;
 
   // TPM password local storage. By convention, we clear the password
   // from TPM as soon as we read it. We store it here locally until
   // EULA screen is closed.
   // TODO(glotov): Sanitize memory used to store password when
   // it's destroyed.
   std::string tpm_password_;
 
   Delegate* delegate_;
 
   EulaView* view_;
 
   TpmPasswordFetcher password_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(EulaScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_EULA_SCREEN_H_