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

tools/perf/benchmarks/skpicture_printer.py

Index: tools/perf/benchmarks/skpicture_printer.py
diff --git a/tools/perf/benchmarks/skpicture_printer.py b/tools/perf/benchmarks/skpicture_printer.py
index 931e91730f6359f4c6f4b6721e33e64ff28c5955..80b683c9217d9335e1a9b1225957b526448d7782 100644
--- a/tools/perf/benchmarks/skpicture_printer.py
+++ b/tools/perf/benchmarks/skpicture_printer.py
@@ -36,6 +36,10 @@ class SkpicturePrinter(benchmark.Benchmark):
     if not args.skp_outdir:
       parser.error('Please specify --skp-outdir')
 
+  @classmethod
+  def Name(cls):
+    return 'skpicture_printer'
+
   def CreatePageTest(self, options):
     return skpicture_printer.SkpicturePrinter(options.skp_outdir)