Add ProgressCallback to DriveServiceInterface::DownloadFile.

chrome/browser/google_apis/drive_service_interface.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_GOOGLE_APIS_DRIVE_SERVICE_INTERFACE_H_
 #define CHROME_BROWSER_GOOGLE_APIS_DRIVE_SERVICE_INTERFACE_H_
 
 #include <string>
 
 // TODO(kochi): Further split gdata_operations.h and include only necessary
@@ skipping 61 matching lines @@
 typedef base::Callback<void(
     const UploadRangeResponse& response,
     scoped_ptr<ResourceEntry> new_entry)> UploadRangeCallback;
 
 // Callback used for AuthorizeApp(). |open_url| is used to open the target
 // file with the authorized app.
 typedef base::Callback<void(GDataErrorCode error,
                             const GURL& open_url)>
     AuthorizeAppCallback;
 
-// Callback used for ResumeUpload().
-typedef base::Callback<void(int64 progress, int64 total)> ProgressCallback;
-
 // This defines an interface for sharing by DriveService and MockDriveService
 // so that we can do testing of clients of DriveService.
 //
 // All functions must be called on UI thread. DriveService is built on top of
 // URLFetcher that runs on UI thread.
 class DriveServiceInterface {
  public:
   virtual ~DriveServiceInterface() {}
 
   // Common service:
@@ skipping 187 matching lines @@
   virtual void AddNewDirectory(const std::string& parent_resource_id,
                                const std::string& directory_name,
                                const GetResourceEntryCallback& callback) = 0;
 
   // Downloads a file from |download_url|. The downloaded file will
   // be stored at |local_cache_path| location. Upon completion, invokes
   // |download_action_callback| with results on the calling thread.
   // If |get_content_callback| is not empty,
   // URLFetcherDelegate::OnURLFetchDownloadData will be called, which will in
   // turn invoke |get_content_callback| on the calling thread.
+  // If |progress_callback| is not empty, it is invoked periodically when
+  // the download made some progress.
   //
   // |download_action_callback| must not be null.
-  // |get_content_callback| may be null.
+  // |get_content_callback| and |progress_callback| may be null.
   virtual void DownloadFile(
       const base::FilePath& virtual_path,
       const base::FilePath& local_cache_path,
       const GURL& download_url,
       const DownloadActionCallback& download_action_callback,
-      const GetContentCallback& get_content_callback) = 0;
+      const GetContentCallback& get_content_callback,
+      const ProgressCallback& progress_callback) = 0;
 
   // Initiates uploading of a new document/file.
   // |content_type| and |content_length| should be the ones of the file to be
   // uploaded.
   // |callback| must not be null.
   virtual void InitiateUploadNewFile(
       const base::FilePath& drive_file_path,
       const std::string& content_type,
       int64 content_length,
       const std::string& parent_resource_id,
@@ skipping 41 matching lines @@
   // Upon completion, invokes |callback| with the link to open the file with
   // the provided app. |callback| must not be null.
   virtual void AuthorizeApp(const std::string& resource_id,
                             const std::string& app_id,
                             const AuthorizeAppCallback& callback) = 0;
 };
 
 }  // namespace google_apis
 
 #endif  // CHROME_BROWSER_GOOGLE_APIS_DRIVE_SERVICE_INTERFACE_H_