raw_io module: Add text_input and text_output

recipe_modules/raw_io/example.py

 # Copyright 2014 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 DEPS = [
   'path',
   'properties',
   'python',
   'raw_io',
   'step',
 ]
 
 
 def RunSteps(api):
   # Read command's stdout and stderr.
   step_result = api.step('echo', ['echo', 'Hello World'],
       stdout=api.raw_io.output(),
       stderr=api.raw_io.output())
   assert step_result.stdout == 'Hello World\n'
   assert step_result.stderr == ''
 
   # Pass stuff to command's stdin, read it from stdout.
   step_result = api.step('cat', ['cat'],
-      stdin=api.raw_io.input(data='hello'),
+      stdin=api.raw_io.text_input(data='hello'),
       stdout=api.raw_io.output('out'))
   assert step_result.stdout == 'hello'
 
+  # TODO(martiniss): comment back in this test case
+  step_result = api.step('cat', ['echo'],
+      stdin=api.raw_io.input(data='\xe2hello'),
+      stdout=api.raw_io.output('\xe2hello'))
+  import pdb; pdb.set_trace()
+  assert step_result.stdout == '\xe2hello'
+
   # Example of auto-mocking stdout. '\n' appended to mock 'echo' behavior.
   step_result = api.step('automock', ['echo', 'huh'],
                  stdout=api.raw_io.output('out'),
                  step_test_data=(
                    lambda: api.raw_io.test_api.stream_output('huh\n')))
   assert step_result.stdout == 'huh\n'
 
   # Example of auto-mocking stdout + stderr.
   step_result = api.step(
     'automock (fail)', ['bash', '-c', 'echo blah && echo fail 1>&2'],
@@ skipping 47 matching lines @@
   yield (api.test('basic') +
       api.properties(some_prop='bad_value') +
       api.step_data('echo',
           stdout=api.raw_io.output('Hello World\n'),
           stderr=api.raw_io.output('')) +
       api.step_data('cat',
           stdout=api.raw_io.output('hello')) +
       api.step_data('override_default_mock',
           api.raw_io.output('good_value', name='test'))
   )