[Findit] Add iterator and crash_iterator for delta test

appengine/findit/util_scripts/crash_queries/crash_printer/crash_printer.py

Index: appengine/findit/util_scripts/crash_queries/crash_printer/crash_printer.py
diff --git a/appengine/findit/util_scripts/crash_queries/crash_printer/crash_printer.py b/appengine/findit/util_scripts/crash_queries/crash_printer/crash_printer.py
new file mode 100644
index 0000000000000000000000000000000000000000..cb8356db241ff8f51259f311a6d4744dceac57a5
--- /dev/null
+++ b/appengine/findit/util_scripts/crash_queries/crash_printer/crash_printer.py
@@ -0,0 +1,29 @@
+# Copyright 2016 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.
+
+import functools
+import json
+import logging
+import os
+import sys
+import zlib
+
+from crash.type_enums import CrashClient
+from crash_queries import client_crash_iterator
+
+CRASH_INFO_FIELDS = ['signature', 'platform']
+
+def PrintCrashInfo(crash):
+  print '\nCrash %s' % crash['id']
+  for crash_info_field in CRASH_INFO_FIELDS:
+    print '%s: %s' % (crash_info_field, crash[crash_info_field])
+
+
+def CrashPrinter(client_id,
+                 start_date, end_date,
+                 print_func=PrintCrashInfo):
+  logging.basicConfig(level=logging.DEBUG)
+  client_crash_iterator.IterateClientCrashes(
+      client_id, print_func, crash_info_fields=CRASH_INFO_FIELDS,
+      start_date=start_date, end_date=end_date)