[IndexedDB] Adding traces, perf tests

tools/perf/page_sets/indexeddb_perf/endure/app-worker.js

 // 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.
 
 // This file simulates a typical background process of an offline-capable
 // authoring application. When in an "online" state it receives chunks of
 // data updates from a simulated server and stores them in a temporary IDB
 // data store. On a different timer, the chunks are drained from the
 // temporary store and combined into larger records in a permanent store.
 // When in an "offline" state, nothing else happens.
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     };
     transaction.onabort = unexpectedAbortCallback;
     transaction.oncomplete = function () {
       log('combine ' + combine_id +
           ' finished, processed ' + combine_chunk_count + ' chunks');
       db.close();
       combineTimeoutId = setTimeout(combine, COMBINE_TIMEOUT);
     };
   };
 }