IndexedDB: Enabled the LevelDB Bloom filter

content/browser/indexed_db/indexed_db_leveldb_coding.cc

 // Copyright (c) 2013 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 "content/browser/indexed_db/indexed_db_leveldb_coding.h"
 
 #include <iterator>
 #include <limits>
 
 #include "base/logging.h"
@@ skipping 142 matching lines @@
 // ----------
 // The prefix is followed by a type byte, the encoded IDB index key, a
 // "sequence" number (obsolete; var int), and the encoded IDB primary key.
 //
 // <database id, object store id, index id, index key, sequence number,
 //   primary key> => "version", primary key [IndexDataKey]
 //
 // The sequence number is obsolete; it was used to allow two entries with the
 // same user (index) key in non-unique indexes prior to the inclusion of the
 // primary key in the data.
+//
+// Note: In order to be compatible with LevelDB's Bloom filter each bit of the
+// encoded key needs to used and "not ignored" by the comparator.
 
 using base::StringPiece;
 using blink::WebIDBKeyType;
 using blink::WebIDBKeyTypeArray;
 using blink::WebIDBKeyTypeBinary;
 using blink::WebIDBKeyTypeDate;
 using blink::WebIDBKeyTypeInvalid;
 using blink::WebIDBKeyTypeMin;
 using blink::WebIDBKeyTypeNull;
 using blink::WebIDBKeyTypeNumber;
@@ skipping 1857 matching lines @@
 scoped_ptr<IndexedDBKey> IndexDataKey::primary_key() const {
   scoped_ptr<IndexedDBKey> key;
   StringPiece slice(encoded_primary_key_);
   if (!DecodeIDBKey(&slice, &key)) {
     // TODO(jsbell): Return error.
   }
   return key.Pass();
 }
 
 }  // namespace content