[telemetry] Script for finding all Telemetry dependencies.

tools/perf/run_benchmark

 #!/usr/bin/env python
 # Copyright (c) 2013 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 os
 import sys
 
-sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, 'telemetry'))
+sys.path.append(os.path.join(
+  os.path.dirname(os.path.realpath(__file__)), os.pardir, 'telemetry'))
 
 from telemetry import test_runner
 
 
 if __name__ == '__main__':
   test_runner.test_aliases = {
       'blink_perf': 'blink_perf.all',
       'image_decoding.tough_decoding_cases':
           'image_decoding.image_decoding_measurement',
       'media.tough_media_cases': 'media.tough_video_cases',
       'page_cycler.pica': 'pica.pica',
   }
   sys.exit(test_runner.Main())