Add new method to disable android device charging.

build/android/pylib/device/device_utils_test.py

Index: build/android/pylib/device/device_utils_test.py
diff --git a/build/android/pylib/device/device_utils_test.py b/build/android/pylib/device/device_utils_test.py
index b7e807e06d74cf063d247e10b99c93fe870b4b5c..0e9fcc86d061a0eb2476e2dc6c7f7edffeecc752 100755
--- a/build/android/pylib/device/device_utils_test.py
+++ b/build/android/pylib/device/device_utils_test.py
@@ -1468,6 +1468,17 @@ class DeviceUtilsSetChargingTest(DeviceUtilsTest):
       self.device.SetCharging(False)
 
 
+class DeviceUtilsSetBatteryMeasurementTest(DeviceUtilsTest):
+
+  def testBatteryMeasurement(self):
+    with self.assertCalls(
+        (self.call.device.RunShellCommand(mock.ANY, check_return=True), []),
+        (self.call.device.GetCharging(), False),
+        (self.call.device.RunShellCommand(mock.ANY, check_return=True), []),
+        (self.call.device.GetCharging(), True)):
+      with self.device.BatteryMeasurement():
+        pass
+
 
 class DeviceUtilsStrTest(DeviceUtilsTest):