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

tools/perf/benchmarks/dom_perf.py

 # Copyright 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 json
 import math
 import os
 
 from telemetry import benchmark
 from telemetry import page as page_module
@@ skipping 62 matching lines @@
 
 @benchmark.Disabled('android', 'linux')
 class DomPerf(benchmark.Benchmark):
   """A suite of JavaScript benchmarks for exercising the browser's DOM.
 
   The final score is computed as the geometric mean of the individual results.
   Scores are not comparable across benchmark suite versions and higher scores
   means better performance: Bigger is better!"""
   test = _DomPerfMeasurement
 
+  @classmethod
+  def Name(cls):
+    return 'dom_perf'
+
   def CreatePageSet(self, options):
     dom_perf_dir = os.path.join(util.GetChromiumSrcDir(), 'data', 'dom_perf')
     run_params = [
       'Accessors',
       'CloneNodes',
       'CreateNodes',
       'DOMDivWalk',
       'DOMTable',
       'DOMWalk',
       'Events',
       'Get+Elements',
       'GridSort',
       'Template'
     ]
     ps = page_set.PageSet(file_path=dom_perf_dir)
     for param in run_params:
       ps.AddUserStory(page_module.Page(
           'file://run.html?reportInJS=1&run=%s' % param, ps, ps.base_dir))
     return ps