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

chrome/browser/google_apis/drive_api_requests.cc

Index: chrome/browser/google_apis/drive_api_requests.cc
diff --git a/chrome/browser/google_apis/drive_api_requests.cc b/chrome/browser/google_apis/drive_api_requests.cc
index 2e495bdffa6ea6e11b9f47362408c8c72c0bcf0d..04e163e7dd9b65d20bca6a9e190efb01cd480069 100644
--- a/chrome/browser/google_apis/drive_api_requests.cc
+++ b/chrome/browser/google_apis/drive_api_requests.cc
@@ -631,5 +631,27 @@ void GetUploadStatusRequest::OnRangeRequestComplete(
   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