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

chrome/browser/google_apis/drive_api_requests.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/drive_api_requests.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/json/json_writer.h"
 #include "base/values.h"
@@ skipping 613 matching lines @@
 
 GetUploadStatusRequest::~GetUploadStatusRequest() {}
 
 void GetUploadStatusRequest::OnRangeRequestComplete(
     const UploadRangeResponse& response,
     scoped_ptr<base::Value> value) {
   DCHECK(CalledOnValidThread());
   ParseFileResourceWithUploadRangeAndRun(callback_, response, value.Pass());
 }
 
+//========================== DownloadFileRequest ==========================
+
+DownloadFileRequest::DownloadFileRequest(
+    RequestSender* sender,
+    const DriveApiUrlGenerator& url_generator,
+    const std::string& resource_id,
+    const base::FilePath& output_file_path,
+    const DownloadActionCallback& download_action_callback,
+    const GetContentCallback& get_content_callback,
+    const ProgressCallback& progress_callback)
+    : DownloadFileRequestBase(
+          sender,
+          download_action_callback,
+          get_content_callback,
+          progress_callback,
+          url_generator.GenerateDownloadFileUrl(resource_id),
+          output_file_path) {
+}
+
+DownloadFileRequest::~DownloadFileRequest() {
+}
+
 }  // namespace drive
 }  // namespace google_apis