[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..70a76f9003b9572a2dc9480fc139a69416e9c45c 100644
--- a/storage/browser/fileapi/local_file_stream_reader.cc
+++ b/storage/browser/fileapi/local_file_stream_reader.cc
@@ -160,6 +160,11 @@ void LocalFileStreamReader::DidGetFileInfoForGetLength(
     return;
   }
   if (!VerifySnapshotTime(expected_modification_time_, file_info)) {
+    LOG(ERROR) << "Expected time "
+               << expected_modification_time_.ToInternalValue()
+               << ", but actual time "
+               << file_info.last_modified.ToInternalValue();
+
     callback.Run(net::ERR_UPLOAD_FILE_CHANGED);
     return;
   }