class_docstr: A specification where kw2 gets moved in front of kw1.
  
  The new API is
  
    def f(a, b, kw2, kw1): ...
code: def update_reorders(self):
      # Note that these should be in the old order.
      self.function_reorders["f"] = ["a", "b", "kw1", "kw2"]
  
imports: import ast
  import io
  import os
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import test
  from tensorflow.tools.compatibility import ast_edits
label_desc: Use image node_id 2 for calling the ReorderKeywordSpec obj's underlying member method code with example usage: obj.update_reorders() without return types