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 353d69572a0dd693bfa6747b97b4354f063564de..a1ebc39f32e78d9832717e1a8c4a07312dac285d 100644
--- a/chrome/browser/chromeos/gdata/gdata_file_system.h
+++ b/chrome/browser/chromeos/gdata/gdata_file_system.h
@@ -35,6 +35,7 @@ class DocumentsServiceInterface;
 class DriveWebAppsRegistryInterface;
 class GDataWapiFeedLoader;
 struct GetDocumentsParams;
+struct GetDocumentsUiState;
 struct UploadFileInfo;
 
 namespace {
@@ -171,6 +172,10 @@ class GDataWapiFeedLoader {
       GDataErrorCode status,
       scoped_ptr<base::Value> data);
 
+  // Callback for handling UI updates caused by document fetching.
+  void OnNotifyDocumentFeedFetched(
+      base::WeakPtr<GetDocumentsUiState> ui_state);
+
   // Save filesystem as proto file.
   void SaveFileSystemAsProto();