[Android] Add optional per-test cooling wait for perf tests.

build/android/pylib/perf/test_runner.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.
 
 """Runs perf tests.
 
 Our buildbot infrastructure requires each slave to run steps serially.
 This is sub-optimal for android, where these steps can run independently on
 multiple connected devices.
 
@@ skipping 255 matching lines @@
            (self._tests['steps'][test_name]['cmd'],
             self.device_serial))
 
     if self._options.collect_chartjson_data:
       self._output_dir = tempfile.mkdtemp()
       cmd = cmd + ' --output-dir=%s' % self._output_dir
 
     logging.info(
         'temperature: %s (0.1 C)',
         str(self._device_battery.GetBatteryInfo().get('temperature')))
+    if self._options.max_battery_temp:
+      self._device_battery.LetBatteryCoolToTemperature(
+          self._options.max_battery_temp)
+
     logging.info('%s : %s', test_name, cmd)
     start_time = datetime.datetime.now()
 
     timeout = self._tests['steps'][test_name].get('timeout', 5400)
     if self._options.no_timeout:
       timeout = None
     logging.info('Timeout for %s test: %s', test_name, timeout)
     full_cmd = cmd
     if self._options.dry_run:
       full_cmd = 'echo %s' % cmd
@@ skipping 69 matching lines @@
     Returns:
       A tuple of (TestRunResults, retry).
     """
     _, result_type = self._LaunchPerfTest(test_name)
     results = base_test_result.TestRunResults()
     results.AddResult(base_test_result.BaseTestResult(test_name, result_type))
     retry = None
     if not results.DidRunPass():
       retry = test_name
     return results, retry