Make allow_subannotations more robust.

scripts/slave/recipes/example/subannotations.py

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+DEPS = [
+  'python',
+  'step',
+]
+
+def GenSteps(api):
+  result = api.python.inline('subannotator',
+      """
+      import sys
+      print 'Some output...'
+      print '@@@BUILD_STEP a build step@@@'
+      print 'Some output inside a build step'
+      print '@@@STEP_TEXT@this is step text@@@'
+      print '@@@BUILD_STEP another build step@@@'
+      """,
+      allow_subannotations=True)
+  result.presentation.step_text = 'Wooot!'
+
+  api.python.inline('disallowed subannotator',
+      """
+      import sys
+      print 'Some output...'
+      print '@@@BUILD_STEP a unique build step@@@'
+      print 'Some output inside a build step'
+      print '@@@STEP_TEXT@this is step text@@@'
+      print '@@@BUILD_STEP another build step@@@'
+      """)
+
+  api.python.inline('subannotator',
+      """
+      import sys
+      print 'Some output...'
+      print '@@@BUILD_STEP a unique build step@@@'
+      print 'Some output inside a build step'
+      print '@@@STEP_TEXT@this is step text@@@'
+      print '@@@BUILD_STEP another build step@@@'
+      sys.exit(1)
+      """,
+      allow_subannotations=True)
+
+  api.step('post run', ['echo', 'post_run'])
+
+def GenTests(api):
+  yield api.test('basic')