message: Making sure the tensorflow_estimator transition works out fine with the renaming. We alias create_resource with _create_resource so that old / new estimator code can work with old / new TF code.
diff: @@ -162,13 +162,21 @@ class TrackableResource(base.Trackable):
  def _create_resource(self):
  """A function that creates a resource handle."""
  - raise NotImplementedError("TrackableResource.create_resource not "
  + raise NotImplementedError("TrackableResource._create_resource not "
  "implemented.")
  + # This method will be removed soon.
  + def create_resource(self):
  + return self._create_resource()
  +
  def _initialize(self):
  """A function that initializes the resource. Optional."""
  pass
  + # This method will be removed soon.
  + def initialize(self):
  + return self._initialize()
  +
  @property
  def resource_handle(self):
  """Returns the resource handle associated with this Resource."""
  