Implement GetResourceListInDirectoryByWapi.

chrome/browser/drive/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_DRIVE_DRIVE_SERVICE_INTERFACE_H_
 #define CHROME_BROWSER_DRIVE_DRIVE_SERVICE_INTERFACE_H_
 
 #include <string>
 
 #include "chrome/browser/google_apis/auth_service_interface.h"
@@ skipping 346 matching lines @@
       int64 content_length,
       const google_apis::UploadRangeCallback& callback) = 0;
 
   // Authorizes a Drive app with the id |app_id| to open the given file.
   // Upon completion, invokes |callback| with the link to open the file with
   // the provided app. |callback| must not be null.
   virtual google_apis::CancelCallback AuthorizeApp(
       const std::string& resource_id,
       const std::string& app_id,
       const google_apis::AuthorizeAppCallback& callback) = 0;
+
+  // This is introduced as a temporary short term solution of the performance
+  // regression issue on Drive API v2.
+  //
+  // This fetches the resource list in a directory by usinig GData WAPI
+  // regardless of base protocol. In other words, even if we enabels Drive API
+  // v2, this method uses GData WAPI to fetch the resource list.
+  //
+  // |directory_resource_id| must not be empty.
+  // |callback| must not be null.
+  virtual google_apis::CancelCallback GetResourceListInDirectoryByWapi(
+      const std::string& directory_resource_id,
+      const google_apis::GetResourceListCallback& callback) = 0;
+
+  // GetResourceListInDirectoryByWapi can be paged. This method fetches the
+  // following pages.
+  //
+  // |callback| must not be null.
+  virtual google_apis::CancelCallback GetRemainingResourceList(
+      const GURL& next_url,
+      const google_apis::GetResourceListCallback& callback) = 0;
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_DRIVE_DRIVE_SERVICE_INTERFACE_H_