Get AboutResource as account metadata for Drive V2.

chrome/browser/chromeos/gdata/gdata_file_system.h

Index: chrome/browser/chromeos/gdata/gdata_file_system.h
diff --git a/chrome/browser/chromeos/gdata/gdata_file_system.h b/chrome/browser/chromeos/gdata/gdata_file_system.h
index ca10eaaacd624618e8545706a3b4a24331100b7b..adecaaf18cfba1af5af0a72c745e4f979f254131 100644
--- a/chrome/browser/chromeos/gdata/gdata_file_system.h
+++ b/chrome/browser/chromeos/gdata/gdata_file_system.h
@@ -141,8 +141,8 @@ class GDataFileSystem : public GDataFileSystemInterface,
   // See also the comment at GDataWapiFeedLoader::UpdateFromFeed().
   GDataFileError UpdateFromFeedForTesting(
       const std::vector<DocumentFeed*>& feed_list,
-      int start_changestamp,
-      int root_feed_changestamp);
+      int64 start_changestamp,
+      int64 root_feed_changestamp);
 
  private:
   friend class GDataFileSystemTest;
@@ -431,6 +431,12 @@ class GDataFileSystem : public GDataFileSystemInterface,
       GDataErrorCode status,
       scoped_ptr<base::Value> data);
 
+  // Callback for handling Drive V2 about resource fetch.
+  void OnGetAboutResource(
+      const GetAvailableSpaceCallback& callback,
+      GDataErrorCode status,
+      scoped_ptr<base::Value> data);
+
   // Callback for handling document remove attempt.
   void OnRemovedDocument(
       const FileOperationCallback& callback,