[Android] Add option to wait for battery temperature to device provisioning

build/android/pylib/device/battery_utils.py

 # Copyright 2015 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.
 
 """Provides a variety of device interactions with power.
 """
 # pylint: disable=unused-argument
 
 import collections
 import contextlib
@@ skipping 366 matching lines @@
       battery_level = self.GetBatteryInfo().get('level')
       if battery_level is None:
         logging.warning('Unable to find current battery level.')
         battery_level = 100
       else:
         logging.info('current battery level: %s', battery_level)
         battery_level = int(battery_level)
       return battery_level >= level
 
     timeout_retry.WaitFor(device_charged, wait_period=wait_period)
+
+  def LetBatteryCoolToTemperature(self, target_temp, wait_period=60):
+    """Lets device sit to give battery time to cool down
+    Args:
+      temp: maximum temperature to allow in tenths of degrees c.
+      wait_period: time in seconds to wait between checking.
+    """
+    def cool_device():
+      temp = self.GetBatteryInfo().get('temperature')
+      if temp is None:
+        logging.warning('Unable to find current battery temperature.')
+        temp = 0
+      else:
+        logging.info('Current battery temperature: %s', temp)
+      return int(temp) <= target_temp
+
+    logging.info('Waiting for the device to cool down to %s degrees.',
+                 target_temp)
+    timeout_retry.WaitFor(cool_device, wait_period=wait_period)