[tools/perf] Resolve the import error when record_wpr tries to discover benchmarks

tools/perf/scripts_smoke_unittest.py

 # Copyright 2015 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.
 
 import json
 import os
 import subprocess
 import sys
 import tempfile
 import unittest
 
-from telemetry import decorators
-
 
 class ScriptsSmokeTest(unittest.TestCase):
 
   perf_dir = os.path.dirname(__file__)
 
   def RunPerfScript(self, command):
     args = [sys.executable] + command.split(' ')
     proc = subprocess.Popen(args, stdout=subprocess.PIPE,
                             stderr=subprocess.STDOUT, cwd=self.perf_dir)
     stdout = proc.communicate()[0]
@@ skipping 19 matching lines @@
     return_code, stdout = self.RunPerfScript('run_benchmark list')
     self.assertEquals(return_code, 0, stdout)
     self.assertIn('Pass --browser to list benchmarks', stdout)
     self.assertIn('dummy_benchmark.stable_benchmark_1', stdout)
 
   def testRunRecordWprHelp(self):
     return_code, stdout = self.RunPerfScript('record_wpr')
     self.assertEquals(return_code, 0, stdout)
     self.assertIn('optional arguments:', stdout)
 
-  @decorators.Disabled('all')  # crbug.com/581103
   def testRunRecordWprList(self):
     return_code, stdout = self.RunPerfScript('record_wpr --list-benchmarks')
     # TODO(nednguyen): Remove this once we figure out why importing
     # small_profile_extender fails on Android dbg.
     # crbug.com/561668
     if 'ImportError: cannot import name small_profile_extender' in stdout:
       self.skipTest('small_profile_extender is missing')
     self.assertEquals(return_code, 0, stdout)
     self.assertIn('kraken', stdout)
 
   def testRunBenchmarkListJSONListsOutBenchmarks(self):
     tmp_file = tempfile.NamedTemporaryFile(delete=False)
     tmp_file_name = tmp_file.name
     tmp_file.close()
     try:
       return_code, _ = self.RunPerfScript(
           'run_benchmark list --json-output %s' % tmp_file_name)
       self.assertEquals(return_code, 0)
       with open(tmp_file_name, 'r') as f:
         benchmark_data = json.load(f)
         self.assertIn('dummy_benchmark.stable_benchmark_1',
                       benchmark_data['steps'])
     finally:
       os.remove(tmp_file_name)