[android] Make build_type a singleton.

build/android/pylib/device_stats_monitor.py

 # Copyright (c) 2012 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.
 
 """Utilities for iotop/top style profiling for android."""
 
 import collections
 import json
 import os
 import subprocess
@@ skipping 11 matching lines @@
       adb: Instance of AndroidComannds.
       hz: Frequency at which to sample device stats.
   """
 
   DEVICE_PATH = constants.TEST_EXECUTABLE_DIR + '/device_stats_monitor'
   PROFILE_PATH = (constants.DEVICE_PERF_OUTPUT_DIR +
       '/device_stats_monitor.profile')
   RESULT_VIEWER_PATH = os.path.abspath(os.path.join(
       os.path.dirname(os.path.realpath(__file__)), 'device_stats_monitor.html'))
 
-  def __init__(self, adb, hz, build_type):
+  def __init__(self, adb, hz):
     self._adb = adb
     host_path = os.path.abspath(os.path.join(
-        constants.DIR_SOURCE_ROOT, 'out', build_type, 'device_stats_monitor'))
+        constants.DIR_SOURCE_ROOT, 'out', constants.GetBuildType(),
+        'device_stats_monitor'))
     self._adb.PushIfNeeded(host_path, DeviceStatsMonitor.DEVICE_PATH)
     self._hz = hz
 
   def Start(self):
     """Starts device stats monitor on the device."""
     self._adb.SetProtectedFileContents(DeviceStatsMonitor.PROFILE_PATH, '')
     self._process = subprocess.Popen(
         ['adb', 'shell', '%s --hz=%d %s' % (
             DeviceStatsMonitor.DEVICE_PATH, self._hz,
             DeviceStatsMonitor.PROFILE_PATH)])
@@ skipping 61 matching lines @@
                                         'user',
                                         'nice',
                                         'system',
                                         'idle',
                                         'iowait',
                                         'irq',
                                         'softirq',
                                        ])
     fields = line.split()
     return cpu_stats._make([fields[0]] + [int(f) for f in fields[1:8]])