Add resource ID based download requests in {GDataWapi/Drive} requests.

chrome/browser/google_apis/base_requests.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.
 //
 // This file provides base classes used to issue HTTP requests for Google
 // APIs.
 
 #ifndef CHROME_BROWSER_GOOGLE_APIS_BASE_REQUESTS_H_
 #define CHROME_BROWSER_GOOGLE_APIS_BASE_REQUESTS_H_
 
@@ skipping 420 matching lines @@
 // Callback type for getting the content from DownloadFileRequest.
 typedef base::Callback<void(
     GDataErrorCode error,
     scoped_ptr<std::string> content)> GetContentCallback;
 
 // Callback type for receiving the completion of DownloadFileRequest.
 typedef base::Callback<void(GDataErrorCode error,
                             const base::FilePath& temp_file)>
     DownloadActionCallback;
 
-// This class performs the request for downloading of a given document/file.
-class DownloadFileRequest : public UrlFetchRequestBase {
+// This is a base class for performing the request for downloading a file.
+class DownloadFileRequestBase : public UrlFetchRequestBase {
  public:
   // download_action_callback:
   //   This callback is called when the download is complete. Must not be null.
   //
   // get_content_callback:
   //   This callback is called when some part of the content is
   //   read. Used to read the download content progressively. May be null.
   //
   // progress_callback:
   //   This callback is called for periodically reporting the number of bytes
   //   downloaded so far. May be null.
   //
   // download_url:
   //   Specifies the target file to download.
   //
   // output_file_path:
   //   Specifies the file path to save the downloaded file.
   //
-  DownloadFileRequest(RequestSender* sender,
-                      const DownloadActionCallback& download_action_callback,
-                      const GetContentCallback& get_content_callback,
-                      const ProgressCallback& progress_callback,
-                      const GURL& download_url,
-                      const base::FilePath& output_file_path);
-  virtual ~DownloadFileRequest();
+  DownloadFileRequestBase(
+      RequestSender* sender,
+      const DownloadActionCallback& download_action_callback,
+      const GetContentCallback& get_content_callback,
+      const ProgressCallback& progress_callback,
+      const GURL& download_url,
+      const base::FilePath& output_file_path);
+  virtual ~DownloadFileRequestBase();
 
  protected:
   // UrlFetchRequestBase overrides.
   virtual GURL GetURL() const OVERRIDE;
   virtual bool GetOutputFilePath(base::FilePath* local_file_path) OVERRIDE;
   virtual void ProcessURLFetchResults(const net::URLFetcher* source) OVERRIDE;
   virtual void RunCallbackOnPrematureFailure(GDataErrorCode code) OVERRIDE;
 
   // net::URLFetcherDelegate overrides.
   virtual void OnURLFetchDownloadProgress(const net::URLFetcher* source,
                                           int64 current, int64 total) OVERRIDE;
   virtual bool ShouldSendDownloadData() OVERRIDE;
   virtual void OnURLFetchDownloadData(
       const net::URLFetcher* source,
       scoped_ptr<std::string> download_data) OVERRIDE;
 
  private:
   const DownloadActionCallback download_action_callback_;
   const GetContentCallback get_content_callback_;
   const ProgressCallback progress_callback_;
   const GURL download_url_;
   const base::FilePath output_file_path_;
 
-  DISALLOW_COPY_AND_ASSIGN(DownloadFileRequest);
+  DISALLOW_COPY_AND_ASSIGN(DownloadFileRequestBase);
 };
 
 }  // namespace google_apis
 
 #endif  // CHROME_BROWSER_GOOGLE_APIS_BASE_REQUESTS_H_