Add ProgressCallback to DriveServiceInterface::DownloadFile.

chrome/browser/google_apis/gdata_wapi_service.cc

 // 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.
 
 #include "chrome/browser/google_apis/gdata_wapi_service.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 319 matching lines @@
           url_generator_,
           base::Bind(&ParseAppListAndRun, callback),
           true));  // Include installed apps.
 }
 
 void GDataWapiService::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) {
+    const GetContentCallback& get_content_callback,
+    const ProgressCallback& progress_callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!download_action_callback.is_null());
-  // get_content_callback may be null.
+  // get_content_callback and progress_callback may be null.
 
   runner_->StartOperationWithRetry(
       new DownloadFileOperation(operation_registry(),
                                 url_request_context_getter_,
                                 download_action_callback,
                                 get_content_callback,
+                                progress_callback,
                                 download_url,
                                 virtual_path,
                                 local_cache_path));
 }
 
 void GDataWapiService::DeleteResource(
     const std::string& resource_id,
     const std::string& etag,
     const EntryActionCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
@@ skipping 238 matching lines @@
 }
 
 void GDataWapiService::OnProgressUpdate(
     const OperationProgressStatusList& list) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   FOR_EACH_OBSERVER(
       DriveServiceObserver, observers_, OnProgressUpdate(list));
 }
 
 }  // namespace google_apis