Package-ify Dromaeo and browser controller functionality

samples/third_party/dromaeo/dromaeo_end_condition.js

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/// File imported by browser_perf_testing.dart controller page to determine when
-/// a performance test is done. This is specific to each performance test.
-
-// The function that does the test to determine if this performance test is
-// completed, given a String containing the event queue (most recent event is
-// last).
-function testIsComplete(message) {
-  return message.indexOf('alldone') != -1;
-}