[Findit] Add skeleton code for delta test script.

appengine/findit/crash/findit_for_chromecrash.py

Index: appengine/findit/crash/findit_for_chromecrash.py
diff --git a/appengine/findit/crash/findit_for_chromecrash.py b/appengine/findit/crash/findit_for_chromecrash.py
index f375bafd35fc8b5dc3a38a2baf86d9e3df3c7197..329845e0f5139205d59e23336aa1bcb4d5ef613a 100644
--- a/appengine/findit/crash/findit_for_chromecrash.py
+++ b/appengine/findit/crash/findit_for_chromecrash.py
@@ -24,6 +24,10 @@ _DEFAULT_TOP_N = 7
 class Culprit(namedtuple('Culprit',
     ['project', 'components', 'cls', 'regression_range'])):
 
+  @property
+  def fields(self):
+    return self._fields
+
   # TODO(wrengr): better name for this method.
   def ToDicts(self):
     """Convert this object to a pair of anonymous dicts for JSON.