Mark all chromium test swarming task requests as idempotent.

scripts/slave/recipes/chromium.py

 # Copyright 2013 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 = [
   'adb',
   'chromium',
   'chromium_android',
   'chromium_tests',
   'isolate',
@@ skipping 19 matching lines @@
   tests = api.chromium_tests.tests_for_builder(
       mastername, buildername, update_step, master_dict)
 
   if not tests:
     return
 
   api.swarming.default_priority = 25
   api.swarming.set_default_dimension('pool', 'Chrome')
   api.swarming.add_default_tag('project:chromium')
   api.swarming.add_default_tag('purpose:CI')
-  # TODO(maruel): Soon!
-  # api.swarming.default_idempotent = True
+  api.swarming.default_idempotent = True
 
   def test_runner():
     failed_tests = []
     #TODO(martiniss) convert loop
     for t in tests:
       try:
         t.pre_run(api, '')
       except api.step.StepFailure:  # pragma: no cover
         failed_tests.append(t)
     for t in tests:
@@ skipping 301 matching lines @@
   yield (
     api.test('perf_test_profile_failure') +
     api.properties.generic(mastername='chromium.perf',
                            buildername='Linux Perf (1)',
                            parent_buildername='Linux Builder',
                            buildnumber=0) +
     api.platform('linux', 64) +
     api.override_step_data(
         'blink_perf.all.release', retcode=1)
   )