[Telemetry] Explicitly define Name() method for all perf benchmarks

tools/perf/benchmarks/kraken.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.
 
 """Runs Mozilla's Kraken JavaScript benchmark."""
 
 import os
 
 from metrics import power
 from telemetry import benchmark
@@ skipping 101 matching lines @@
                     '(http://krakenbenchmark.mozilla.org/)'))
 
 
 class Kraken(benchmark.Benchmark):
   """Mozilla's Kraken JavaScript benchmark.
 
   http://krakenbenchmark.mozilla.org/
   """
   test = _KrakenMeasurement
 
+  @classmethod
+  def Name(cls):
+    return 'kraken'
+
   def CreatePageSet(self, options):
     ps = page_set.PageSet(
       archive_data_file='../page_sets/data/kraken.json',
       file_path=os.path.abspath(__file__),
       bucket=page_set.PARTNER_BUCKET)
     ps.AddUserStory(page_module.Page(
         'http://krakenbenchmark.mozilla.org/kraken-1.1/driver.html',
         ps, ps.base_dir))
     return ps