Add IGNORE_DEPS_CHANGES flag and coverage builder.

scripts/slave/recipe_modules/chromium_tests/builders.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.
 
 from recipe_engine.types import freeze
 
 from . import chromium
 from . import chromium_android
 from . import chromium_chrome
 from . import chromium_chromiumos
@@ skipping 42 matching lines @@
   'tryserver.chromium.mac': tryserver_chromium_mac.SPEC,
   'tryserver.chromium.perf': tryserver_chromium_perf.SPEC,
 
   # Additional build configurations to test against for coverage. This is useful
   # when adding configuration options that will only be exercised in other
   # repositories.
   #
   # Note that this master is not real, and consequently this build configuration
   # will never be used in production.
   'bot_update.always_on': {
+    'settings': {
+      'build_gs_bucket': '!fake-coverage-bucket',
+    },
     'builders': {
       'coverage_clobber': {
         'chromium_config': 'chromium',
         'gclient_config': 'chromium',
         'clobber': True,
         'archive_build': True,
         'testing': {
           'platform': 'linux',
         },
         'gs_bucket': 'invalid',
       },
+
+      # Add a coverage builder to exercise configs that are leveraged in other
+      # recipe collections to build chrome packages:
+      # - "ignore_deps_changes"
+      'Package Builder (Coverage)': {
+        'chromium_config': 'chromium',
+        'chromium_apply_config': ['chromeos', 'ninja_confirm_noop',
+                                  'ignore_deps_changes', 'mb'],
+        'gclient_config': 'chromium',
+        'chromium_config_kwargs': {
+          'BUILD_CONFIG': 'Debug',
+          'TARGET_BITS': 64,
+        },
+        'bot_type': 'builder',
+        'testing': {
+          'platform': 'linux',
+        },
+      },
     },
   },
 })