[BlobStorage] Implementing disk.

storage/browser/fileapi/local_file_stream_reader.cc

Index: storage/browser/fileapi/local_file_stream_reader.cc
diff --git a/storage/browser/fileapi/local_file_stream_reader.cc b/storage/browser/fileapi/local_file_stream_reader.cc
index 74a9cc9bac2432fc7f81f3d465e173bb55e10b99..94b8e5f765a8e139dbc34d539700294d2a1ec965 100644
--- a/storage/browser/fileapi/local_file_stream_reader.cc
+++ b/storage/browser/fileapi/local_file_stream_reader.cc
@@ -160,6 +160,8 @@ void LocalFileStreamReader::DidGetFileInfoForGetLength(
     return;
   }
   if (!VerifySnapshotTime(expected_modification_time_, file_info)) {
+    LOG(ERROR) << "Expected time " << expected_modification_time_
+               << ", but actual time " << file_info.last_modified;
     callback.Run(net::ERR_UPLOAD_FILE_CHANGED);
     return;
   }