message: TensorFlowTestCase.assertProtoEquals: Print failure msg for proto expected message
  (It was already printed for a text expected message.)
diff: @@ -2179,7 +2179,7 @@ class TensorFlowTestCase(googletest.TestCase):
  msg = msg if msg else ""
  if isinstance(expected_message_maybe_ascii, type(message)):
  expected_message = expected_message_maybe_ascii
  - self._AssertProtoEquals(expected_message, message)
  + self._AssertProtoEquals(expected_message, message, msg=msg)
  elif isinstance(expected_message_maybe_ascii, (str, bytes)):
  expected_message = type(message)()
  text_format.Merge(
  