[system health] Compute power and clock sync latency metrics

tools/perf/benchmarks/system_health.py

 # Copyright 2016 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.
 
 import re
 
 from core import perf_benchmark
 from telemetry import benchmark
 from telemetry.timeline import chrome_trace_category_filter
 from telemetry.web_perf import timeline_based_measurement
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   https://goo.gl/Jek2NL.
   """
 
   def CreateTimelineBasedMeasurementOptions(self):
     options = timeline_based_measurement.Options(
         chrome_trace_category_filter.ChromeTraceCategoryFilter())
     options.config.chrome_trace_config.category_filter.AddFilterString('rail')
     options.config.enable_battor_trace = True
     options.config.enable_chrome_trace = True
+    options.SetTimelineBasedMetrics(['clockSyncLatencyMetric', 'powerMetric'])
     return options
 
   def CreateStorySet(self, options):
     return page_sets.SystemHealthStorySet(platform=self.PLATFORM)
 
   @classmethod
   def ShouldTearDownStateAfterEachStoryRun(cls):
     return True
 
   @classmethod
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   and load a blank page with multiprocess enabled.
   """
 
   def SetExtraBrowserOptions(self, options):
     options.AppendExtraBrowserArgs(
         ['--webview-sandboxed-renderer'])
 
   @classmethod
   def Name(cls):
     return 'system_health.webview_startup_multiprocess'