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

tools/perf/benchmarks/media.py

Index: tools/perf/benchmarks/media.py
diff --git a/tools/perf/benchmarks/media.py b/tools/perf/benchmarks/media.py
index a45fd5d5bc90e4f8ac2772d26f4a38664ef95da0..47fed0bd15cccf7ca63a0425cb25bf597af8cc66 100644
--- a/tools/perf/benchmarks/media.py
+++ b/tools/perf/benchmarks/media.py
@@ -39,6 +39,10 @@ class Media(benchmark.Benchmark):
   test = media.Media
   page_set = page_sets.ToughVideoCasesPageSet
 
+  @classmethod
+  def Name(cls):
+    return 'media.tough_video_cases'
+
 
 @benchmark.Disabled
 class MediaNetworkSimulation(benchmark.Benchmark):
@@ -46,6 +50,10 @@ class MediaNetworkSimulation(benchmark.Benchmark):
   test = media.Media
   page_set = page_sets.MediaCnsCasesPageSet
 
+  @classmethod
+  def Name(cls):
+    return 'media.media_cns_cases'
+
 
 @benchmark.Enabled('android')
 @benchmark.Disabled('l', 'android-webview') # WebView: crbug.com/419689
@@ -57,6 +65,10 @@ class MediaAndroid(benchmark.Benchmark):
   # Exclude is_4k and 50 fps media files (garden* & crowd*).
   options = {'page_label_filter_exclude': 'is_4k,is_50fps'}
 
+  @classmethod
+  def Name(cls):
+    return 'media.android.tough_video_cases'
+
 
 @benchmark.Enabled('chromeos')
 class MediaChromeOS4kOnly(benchmark.Benchmark):
@@ -71,6 +83,10 @@ class MediaChromeOS4kOnly(benchmark.Benchmark):
       'page_label_filter_exclude': 'is_50fps'
   }
 
+  @classmethod
+  def Name(cls):
+    return 'media.chromeOS4kOnly.tough_video_cases'
+
 
 @benchmark.Enabled('chromeos')
 class MediaChromeOS(benchmark.Benchmark):
@@ -85,6 +101,10 @@ class MediaChromeOS(benchmark.Benchmark):
   # Exclude is_50fps test files: crbug/331816
   options = {'page_label_filter_exclude': 'is_4k,is_50fps'}
 
+  @classmethod
+  def Name(cls):
+    return 'media.chromeOS.tough_video_cases'
+
 
 @benchmark.Disabled('android-webview') # crbug.com/419689
 class MediaSourceExtensions(benchmark.Benchmark):
@@ -92,6 +112,10 @@ class MediaSourceExtensions(benchmark.Benchmark):
   test = _MSEMeasurement
   page_set = page_sets.MseCasesPageSet
 
+  @classmethod
+  def Name(cls):
+    return 'media.mse_cases'
+
   def CustomizeBrowserOptions(self, options):
     # Needed to allow XHR requests to return stream objects.
     options.AppendExtraBrowserArgs(