gdata: Periodic refresh should be active for file lists loaded from cache.

chrome/browser/chromeos/gdata/gdata_file_system.cc

 // 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.
 
 #include "chrome/browser/chromeos/gdata/gdata_file_system.h"
 
 #include <set>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 1034 matching lines @@
   webapps_registry_->UpdateFromFeed(account_metadata.get());
 
   bool changes_detected = true;
   if (local_changestamp >= account_metadata->largest_changestamp()) {
     if (local_changestamp > account_metadata->largest_changestamp()) {
       LOG(WARNING) << "Cached client feed is fresher than server, client = "
                    << local_changestamp
                    << ", server = "
                    << account_metadata->largest_changestamp();
     }
-    directory_service_->set_origin(initial_origin);
+    // If our cache holds the latest state from the server, change the
+    // state to FROM_SERVER.
+    directory_service_->set_origin(
+        initial_origin == FROM_CACHE ? FROM_SERVER : initial_origin);
     changes_detected = false;
   }
 
   // No changes detected, continue with search as planned.
   if (!changes_detected) {
     if (!callback.is_null())
       FindEntryByPathSyncOnUIThread(search_file_path, callback);
     return;
   }
 
@@ skipping 3201 matching lines @@
   }
 
   PlatformFileInfoProto entry_file_info;
   GDataEntry::ConvertPlatformFileInfoToProto(*file_info, &entry_file_info);
   *entry_proto->mutable_file_info() = entry_file_info;
   if (!callback.is_null())
     callback.Run(GDATA_FILE_OK, entry_proto.Pass());
 }
 
 }  // namespace gdata