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

tools/perf/benchmarks/indexeddb_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.
 
 """Runs Chromium's IndexedDB performance test. These test:
 
 Databases:
   create/delete
 Keys:
   create/delete
@@ skipping 78 matching lines @@
 
   def CustomizeBrowserOptions(self, options):
     memory.MemoryMetric.CustomizeBrowserOptions(options)
     power.PowerMetric.CustomizeBrowserOptions(options)
     v8_object_stats.V8ObjectStatsMetric.CustomizeBrowserOptions(options)
 
 class IndexedDb(benchmark.Benchmark):
   """Chromium's IndexedDB Performance tests."""
   test = _IndexedDbMeasurement
 
+  @classmethod
+  def Name(cls):
+    return 'indexeddb_perf'
+
   def CreatePageSet(self, options):
     indexeddb_dir = os.path.join(util.GetChromiumSrcDir(), 'chrome', 'test',
                                  'data', 'indexeddb')
     ps = page_set.PageSet(file_path=indexeddb_dir)
     ps.AddUserStory(page_module.Page('file://perf_test.html', ps, ps.base_dir))
     return ps