Add method for identifying different InfoBars

chrome/browser/android/download/chrome_download_manager_overwrite_infobar_delegate.h

 // Copyright 2015 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_ANDROID_DOWNLOAD_CHROME_DOWNLOAD_MANAGER_OVERWRITE_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_ANDROID_DOWNLOAD_CHROME_DOWNLOAD_MANAGER_OVERWRITE_INFOBAR_DELEGATE_H_
 
 #include "base/android/scoped_java_ref.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
@@ skipping 19 matching lines @@
       const base::FilePath& suggested_download_path,
       const DownloadTargetDeterminerDelegate::FileSelectedCallback&
           file_selected_callback);
 
  private:
   ChromeDownloadManagerOverwriteInfoBarDelegate(
       const base::FilePath& suggested_path,
       const DownloadTargetDeterminerDelegate::FileSelectedCallback& callback);
 
   // DownloadOverwriteInfoBarDelegate:
+  std::string GetIdentifier() const override;
   bool OverwriteExistingFile() override;
   bool CreateNewFile() override;
   std::string GetFileName() const override;
   std::string GetDirName() const override;
   std::string GetDirFullPath() const override;
   void InfoBarDismissed() override;
 
   // Called on the FILE thread to create a new file.  Calls |callback| on the UI
   // thread when finished.
   static void CreateNewFileInternal(
       const base::FilePath& suggested_download_path,
       const DownloadTargetDeterminerDelegate::FileSelectedCallback& callback);
 
   // The suggested download path from download target determiner. This is used
   // to show users the file name and the directory that will be used.
   base::FilePath suggested_download_path_;
 
   // A callback to download target determiner to notify that file selection
   // is made (or cancelled).
   DownloadTargetDeterminerDelegate::FileSelectedCallback
       file_selected_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeDownloadManagerOverwriteInfoBarDelegate);
 };
 
 }  // namespace android
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_ANDROID_DOWNLOAD_CHROME_DOWNLOAD_MANAGER_OVERWRITE_INFOBAR_DELEGATE_H_