Revert "build: remove diagnose_goma step to stop leaks"

scripts/slave/recipe_modules/chromium_tests/api.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 collections
 import contextlib
 import copy
 import itertools
 import json
 
@@ skipping 292 matching lines @@
 
     return test_runner
 
   def get_tests(self, bot_config, bot_db):
     """Returns a tuple: list of tests, and list of tests on the triggered
        testers."""
 
     assert isinstance(bot_db, bdb_module.BotConfigAndTestDB), \
         "bot_db argument %r was not a BotConfigAndTestDB" % (bot_db)
 
-    return bot_config.get_tests(bot_db)
+    tests, tests_including_triggered = bot_config.get_tests(bot_db)
+
+    if bot_config.get('goma_canary') or bot_config.get('goma_staging'):
+      tests.insert(0, steps.DiagnoseGomaTest())
+      tests_including_triggered.insert(0, steps.DiagnoseGomaTest())
+
+    return tests, tests_including_triggered
 
   def get_compile_targets(self, bot_config, bot_db, tests):
     assert isinstance(bot_db, bdb_module.BotConfigAndTestDB), \
         "bot_db argument %r was not a BotConfigAndTestDB" % (bot_db)
 
     compile_targets = bot_config.get_compile_targets(self, bot_db, tests)
     return sorted(set(compile_targets))
 
   def transient_check(self, update_step, command):
     """Runs command, checking for transience if this is a try job.
@@ skipping 515 matching lines @@
   def get_compile_targets_for_scripts(self):
     return self.m.python(
         name='get compile targets for scripts',
         script=self.m.path['checkout'].join(
             'testing', 'scripts', 'get_compile_targets.py'),
         args=[
             '--output', self.m.json.output(),
             '--',
         ] + self.get_common_args_for_scripts(),
         step_test_data=lambda: self.m.json.test_api.output({}))