Reland "Allow multiple devices on bisects hosts "

scripts/slave/recipe_modules/bisect_tester/api.py

Index: scripts/slave/recipe_modules/bisect_tester/api.py
diff --git a/scripts/slave/recipe_modules/bisect_tester/api.py b/scripts/slave/recipe_modules/bisect_tester/api.py
index 53181308999431813973d751cb20ebcf3688d76a..83979a4834cf04cb1c1492e4057c8974759fd651 100644
--- a/scripts/slave/recipe_modules/bisect_tester/api.py
+++ b/scripts/slave/recipe_modules/bisect_tester/api.py
@@ -17,6 +17,24 @@ class BisectTesterApi(recipe_api.RecipeApi):
 
   def __init__(self, **kwargs):
     super(BisectTesterApi, self).__init__(**kwargs)
+    self._device_to_test = None
+    self._devices_tested = []
+
+  @property
+  def device_to_test(self):
+    return self._device_to_test
+
+  @property
+  def devices_tested(self): # pragma: no cover
+    return self._devices_tested
+
+  @device_to_test.setter
+  def device_to_test(self, value): # pragma: no cover
+    self._device_to_test = value
+
+  @devices_tested.setter
+  def devices_tested(self, value): # pragma: no cover
+    self._devices_tested = value
 
   def local_test_enabled(self):
     buildername = os.environ.get('BUILDBOT_BUILDERNAME')