Update the number of fetched files more frequently.

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 9edd41ad29aa8d1a7dc1908140cd5e51ad5ada08..af5453b924561ddd7dcf82b57fabbbe818bf467c 100644
--- a/chrome/browser/chromeos/gdata/gdata_file_system.h
+++ b/chrome/browser/chromeos/gdata/gdata_file_system.h
@@ -144,6 +144,9 @@ class GDataFileSystem : public GDataFileSystemInterface,
   // Defines set of parameters sent to callback OnGetDocuments().
   struct GetDocumentsParams;
 
+  // Defines set of parameters sent to callback OnNotifyDocumentFeedFetched().
+  struct GetDocumentsUiState;
+
   // Defines set of parameters passes to intermediate callbacks during
   // execution of CreateDirectory() method.
   struct CreateDirectoryParams;
@@ -639,6 +642,10 @@ class GDataFileSystem : public GDataFileSystemInterface,
   void NotifyDirectoryChanged(const FilePath& directory_path);
   void NotifyDocumentFeedFetched(int num_accumulated_entries);
 
+  // Callback for handling UI updates caused by document fetching.
+  void OnNotifyDocumentFeedFetched(
+      base::WeakPtr<GetDocumentsUiState> ui_state);
+
   // Runs the callback and notifies that the initial load is finished.
   void RunAndNotifyInitialLoadFinished(
     const FindEntryCallback& callback,