raw_io module: Add text_input and text_output

recipe_modules/raw_io/example.py

Index: recipe_modules/raw_io/example.py
diff --git a/recipe_modules/raw_io/example.py b/recipe_modules/raw_io/example.py
index 6c565de4577477c4529d9f15fa39674f4ffc207f..8e1ba81cba26655bc902209e0f555915371b28c3 100644
--- a/recipe_modules/raw_io/example.py
+++ b/recipe_modules/raw_io/example.py
@@ -21,10 +21,17 @@ def RunSteps(api):
 
   # 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'),