Add url filter to idb perf tests

chrome/test/data/indexeddb/perf_test.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.
 
 var overallTestStartTime = Date.now();
 var kUseIndex = true;
 var kDontUseIndex = false;
 var kReadKeysOnly = true;
 var kReadDataToo = false;
 var kWriteToo = true;
@@ skipping 71 matching lines @@
   [testCreateAndDeleteIndex, 5000]
 ];
 
 var currentTest = 0;
 
 function test() {
   runNextTest();
 }
 
 function runNextTest() {
-  if (currentTest < tests.length) {
+  var filter = window.location.hash.slice(1);
+  do {
     var test = tests[currentTest++].slice();
     var f = test.shift();
+  } while (currentTest < tests.length &&
+           filter && f.name != filter)
+
+  if (currentTest < tests.length) {
     test.push(runNextTest);
     f.apply(null, test);
   } else {
     onAllTestsComplete();
   }
 }
 
 function onAllTestsComplete() {
   var overallDuration = Date.now() - overallTestStartTime;
   automation.addResult("OverallTestDuration", overallDuration);
@@ skipping 323 matching lines @@
 
     var mode = "readonly";
     if (numWritesPerTransaction)
       mode = "readwrite";
 
     var transaction = getTransaction(db, objectStoreNames, mode, batchComplete);
     putRandomValues(transaction, objectStoreNames, numWritesPerTransaction,
         numKeys);
   }
 }