Add next_version_mini_installer to MiniInstallerTest's compile targets.

scripts/slave/recipe_modules/chromium_tests/steps.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.
 
 import datetime
 import re
 import string
 
 
 class Test(object):
@@ skipping 1625 matching lines @@
 
   def failures(self, api, suffix):
     return self._test_runs[suffix].test_utils.test_results.unexpected_failures
 
 
 class MiniInstallerTest(PythonBasedTest):  # pylint: disable=W0232
   name = 'test_installer'
 
   @staticmethod
   def compile_targets(_):
-    return ['mini_installer']
+    return ['mini_installer', 'next_version_mini_installer']

[Dirk Pranke, 2016/07/26 18:47:51]

Didn't we try this once before? You can't change this like this, because the
official builders will pull this version of the recipe, and try to build
next_version_mini_installer on a branch, where the target doesn't (yet?) exist.

Or does the target now exist on all of our branches?

[fdoray, 2016/07/26 19:00:59]

Target was added before the M52 branch
https://chromium.googlesource.com/chromium/src/+/fb048bff9ec1ecdb632386878c33...
IIUC, the fact that M52 was promoted to stable means that the target now exists
on all supported branches (M51 is no longer supported).

 
   def run_step(self, api, suffix, cmd_args, **kwargs):
     test_path = api.path['checkout'].join('chrome', 'test', 'mini_installer')
     args = [
       '--build-dir', api.chromium.c.build_dir,
       '--target', api.chromium.c.build_config_fs,
       '--force-clean',
       '--config', test_path.join('config', 'config.config'),
     ]
     args.extend(cmd_args)
@@ skipping 87 matching lines @@
           args=args)
       api.gsutil.upload(
           temp_output_dir.join(
               '%s-android-chrome.json' % timestamp_string),
           'chromium-annotated-tests', 'android')
 
 GOMA_TESTS = [
   GTestTest('base_unittests'),
   GTestTest('content_unittests'),
 ]