Add key_idle_power_cases for ensuring idle activity on Android

tools/perf/benchmarks/thread_times.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 telemetry import benchmark
 
 from benchmarks import silk_flags
 from measurements import thread_times
 import page_sets
 
 class _ThreadTimes(benchmark.Benchmark):
+  def __init__(self, measure_per_frame=True):
+    super(_ThreadTimes, self).__init__()
+    self._measure_per_frame = measure_per_frame
+
   @classmethod
   def AddBenchmarkCommandLineArgs(cls, parser):
     parser.add_option('--report-silk-details', action='store_true',
                       help='Report details relevant to silk.')
 
   @classmethod
   def Name(cls):
     return 'thread_times'
 
   def CreatePageTest(self, options):
-    return thread_times.ThreadTimes(options.report_silk_details)
+    return thread_times.ThreadTimes(options.report_silk_details,
+                                    self._measure_per_frame)
 
 
 @benchmark.Enabled('android')
 class ThreadTimesKeySilkCases(_ThreadTimes):
   """Measures timeline metrics while performing smoothness action on key silk
   cases."""
   page_set = page_sets.KeySilkCasesPageSet
 
   @classmethod
   def Name(cls):
@@ skipping 49 matching lines @@
 
 @benchmark.Enabled('android')
 class ThreadTimesPolymer(_ThreadTimes):
   """Measures timeline metrics while performing smoothness action on
   Polymer cases."""
   page_set = page_sets.PolymerPageSet
   @classmethod
   def Name(cls):
     return 'thread_times.polymer'
 
+@benchmark.Enabled('android')
+class ThreadTimesKeyPowerCases(_ThreadTimes):
+  """Measures timeline metrics for sites that should be idle in foreground
+  and background scenarios. The metrics are aggregated rather than per-frame."""
+  page_set = page_sets.KeyPowerCasesPageSet
+
+  def __init__(self):
+    super(ThreadTimesKeyPowerCases, self).__init__(measure_per_frame=False)
+
+  @classmethod
+  def Name(cls):
+    return 'thread_times.key_power_cases'