Update tools/perf to use cloud_storage from catapult.

tools/perf/PRESUBMIT.py

 # Copyright 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.
 
 """Presubmit script for changes affecting tools/perf/.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into depot_tools.
 """
 
@@ skipping 21 matching lines @@
   return [
       telemetry_dir,
       input_api.os_path.join(telemetry_dir, 'third_party', 'mock'),
   ]
 
 
 def _CheckWprShaFiles(input_api, output_api):
   """Check whether the wpr sha files have matching URLs."""
   old_sys_path = sys.path
   try:
-    # TODO: The cloud_storage module is in telemetry.
-    sys.path = [os.path.join('..', 'telemetry')] + sys.path
+    perf_dir = input_api.PresubmitLocalPath()
+    catapult_path = os.path.abspath(os.path.join(
+        perf_dir, '..', '..', 'third_party', 'catapult', 'catapult_base'))
+    sys.path.insert(1, catapult_path)
     from catapult_base import cloud_storage
   finally:
     sys.path = old_sys_path
 
   results = []
   for affected_file in input_api.AffectedFiles(include_deletes=False):
     filename = affected_file.AbsoluteLocalPath()
     if not filename.endswith('wpr.sha1'):
       continue
     expected_hash = cloud_storage.ReadHash(filename)
@@ skipping 76 matching lines @@
   bots_string = ';'.join(bots)
   description = original_description
   description += '\nCQ_EXTRA_TRYBOTS=%s' % bots_string
   results.append(output_api.PresubmitNotifyResult(
       'Automatically added Perf trybots to run Telemetry benchmarks on CQ.'))
 
   if description != original_description:
    rietveld_obj.update_description(issue, description)
 
   return results