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

tools/perf/benchmarks/robohornet_pro.py

Index: tools/perf/benchmarks/robohornet_pro.py
diff --git a/tools/perf/benchmarks/robohornet_pro.py b/tools/perf/benchmarks/robohornet_pro.py
index d990f9ff69c62c03f4345f735fd51a4688565c6e..1fd50b85ada08899a6f6707d7a74c49aafbebfab 100644
--- a/tools/perf/benchmarks/robohornet_pro.py
+++ b/tools/perf/benchmarks/robohornet_pro.py
@@ -54,6 +54,10 @@ class RobohornetPro(benchmark.Benchmark):
   """
   test = _RobohornetProMeasurement
 
+  @classmethod
+  def Name(cls):
+    return 'robohornet_pro'
+
   def CreatePageSet(self, options):
     ps = page_set.PageSet(
         archive_data_file='../page_sets/data/robohornet_pro.json',