[BlobAsync] Patch 2: Common Constants

storage/browser/blob/blob_reader.cc

 // Copyright 2015 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 "storage/browser/blob/blob_reader.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/bind.h"
@@ skipping 521 matching lines @@
       return file_stream_provider_
           ->CreateFileStreamReader(
               item.filesystem_url(), item.offset() + additional_offset,
               item.length() == std::numeric_limits<uint64_t>::max()
                   ? storage::kMaximumLength
                   : item.length() - additional_offset,
               item.expected_modification_time())
           .Pass();
     case DataElement::TYPE_BLOB:
     case DataElement::TYPE_BYTES:
+    case DataElement::TYPE_BYTES_DESCRIPTION:
     case DataElement::TYPE_DISK_CACHE_ENTRY:
     case DataElement::TYPE_UNKNOWN:
       break;
   }
 
   NOTREACHED();
   return nullptr;
 }
 
 void BlobReader::SetFileReaderAtIndex(size_t index,
                                       scoped_ptr<FileStreamReader> reader) {
   auto found = index_to_reader_.find(current_item_index_);
   if (found != index_to_reader_.end()) {
     if (found->second) {
       delete found->second;
     }
     if (!reader.get()) {
       index_to_reader_.erase(found);
       return;
     }
     found->second = reader.release();
   } else if (reader.get()) {
     index_to_reader_[current_item_index_] = reader.release();
   }
 }
 
 }  // namespace storage