Add live tests for measuring data savings metrics

tools/chrome_proxy/live_tests/chrome_proxy_benchmark.py

 # Copyright 2014 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.
 
 from live_tests import chrome_proxy_measurements as measurements
 from live_tests import pagesets
 from telemetry import benchmark
 
 
 class ChromeProxyLatency(benchmark.Benchmark):
   tag = 'latency'
   test = measurements.ChromeProxyLatency
   page_set = pagesets.Top20StorySet
 
   @classmethod
   def Name(cls):
     return 'chrome_proxy_benchmark.latency.top_20'
 
 
 class ChromeProxyLatencyDirect(benchmark.Benchmark):
   tag = 'latency_direct'
   test = measurements.ChromeProxyLatencyDirect
   page_set = pagesets.Top20StorySet
 
   @classmethod
   def Name(cls):
     return 'chrome_proxy_benchmark.latency_direct.top_20'
 
 
+class ChromeProxyLatencyMetrics(benchmark.Benchmark):
+  tag = 'latency_metrics'
+  test = measurements.ChromeProxyLatencyDirect
+  page_set = pagesets.MetricsStorySet
+
+  @classmethod
+  def Name(cls):
+    return 'chrome_proxy_benchmark.latency_metrics.metrics'
+
+
 class ChromeProxyDataSaving(benchmark.Benchmark):
   tag = 'data_saving'
   test = measurements.ChromeProxyDataSaving
   page_set = pagesets.Top20StorySet
 
   @classmethod
   def Name(cls):
     return 'chrome_proxy_benchmark.data_saving.top_20'
 
 
 class ChromeProxyDataSavingDirect(benchmark.Benchmark):
   tag = 'data_saving_direct'
   test = measurements.ChromeProxyDataSavingDirect
   page_set = pagesets.Top20StorySet
 
   @classmethod
   def Name(cls):
     return 'chrome_proxy_benchmark.data_saving_direct.top_20'
 
+class ChromeProxyDataSavingMetrics(benchmark.Benchmark):
+  tag = 'data_saving_metrics'
+  test = measurements.ChromeProxyDataSavingDirect
+  page_set = pagesets.MetricsStorySet
+
+  @classmethod
+  def Name(cls):
+    return 'chrome_proxy_benchmark.data_saving_metrics.metrics'
+