[Android] Support idle wakeup measurement with /proc/timer_stats

tools/perf/measurements/smoothness_unittest.py

 # Copyright 2013 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 sys
 
 from telemetry import decorators
 from telemetry.page import page
 from telemetry.testing import options_for_unittests
 from telemetry.testing import page_test_test_case
 from telemetry.util import wpr_modes
 
 from measurements import smoothness
 
 
 class FakeTracingController(object):
   def __init__(self):
     self.category_filter = None
   def Start(self, options, category_filter):
     del options  # unused
     self.category_filter = category_filter
 
   def IsChromeTracingSupported(self):
     return True
 
 
 class FakePlatform(object):
   def __init__(self):
     self.tracing_controller = FakeTracingController()
+  def CanMeasureIdleWakeUps(self):

[nednguyen, 2015/07/29 22:22:45]

Why do you need to add this? IIRC, we removed power_metric from smoothness
measurement

+    return False
 
 
 class FakeBrowser(object):
   def __init__(self):
     self.platform = FakePlatform()
 
 
 class FakeTab(object):
   def __init__(self):
     self.browser = FakeBrowser()
@@ skipping 91 matching lines @@
     max_frame_delay = results.FindAllPageSpecificValuesNamed('max_frame_delay')
     self.assertEquals(1, len(max_frame_delay))
     self.assertGreater(max_frame_delay[0].GetRepresentativeNumber, 0)
 
     frame_lengths = results.FindAllPageSpecificValuesNamed('frame_lengths')
     self.assertEquals(1, len(frame_lengths))
     self.assertGreater(frame_lengths[0].GetRepresentativeNumber, 0)
 
   def testCleanUpTrace(self):
     self.TestTracingCleanedUp(smoothness.Smoothness, self._options)