[android] Create Battery Utils to seperate power functionality

build/android/pylib/device/device_errors.py

Index: build/android/pylib/device/device_errors.py
diff --git a/build/android/pylib/device/device_errors.py b/build/android/pylib/device/device_errors.py
index 26d9eaf48b71c4c48a7b3cfa48a436b98fc70f07..66a226ca5206e590c66732192b03ce4af8a95368 100644
--- a/build/android/pylib/device/device_errors.py
+++ b/build/android/pylib/device/device_errors.py
@@ -42,6 +42,13 @@ class AdbCommandFailedError(CommandFailedError):
     super(AdbCommandFailedError, self).__init__(message, device_serial)
 
 
+class DeviceVersionError(CommandFailedError):
+  """Exception for device version failures."""
+
+  def __init__(self, message, device_serial=None):
+    super(DeviceVersionError, self).__init__(message, device_serial)
+
+
 class AdbShellCommandFailedError(AdbCommandFailedError):
   """Exception for shell command failures run via adb."""