Add url filter to idb perf tests

This allows you to filter the perf tests with a hashtag. For example, adding '#testCreateAndDeleteDatabase' will run only tests with that name. This is just a debugging thing.

R=ericu@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/10826291

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151841 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/data/indexeddb/perf_test.js

@@ -97,9 +97,14 @@ function test() {
 }
 
 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 {