Create MSan config for Chromium recipe module + add WebRTC MSan recipe.

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 copy
 
 from slave import recipe_api
 
 
 # Different types of builds this recipe module can do.
@@ skipping 47 matching lines @@
     'gclient_config': 'ios',
   },
   'chromium_ios_ninja': {
     'chromium_config': 'chromium_ios_ninja',
     'gclient_config': 'ios',
   },
   'chromium_ios_simulator': {
     'chromium_config': 'chromium_ios_simulator',
     'gclient_config': 'ios',
   },
+  'chromium_msan': {
+    'chromium_config': 'chromium_msan',
+    'gclient_config': 'chromium',
+  },
   'chromium_no_goma': {
     'chromium_config': 'chromium_no_goma',
     'gclient_config': 'chromium',
   },
   'chromium_oilpan': {
     'chromium_config': 'chromium_official',
     'chromium_apply_config': ['oilpan'],
     'gclient_config': 'chromium',
     'gclient_apply_config': ['chrome_internal'],
   },
@@ skipping 239 matching lines @@
       self.m.chromium.crash_handler()
 
     try:
       return test_runner()
     finally:
       if self.m.platform.is_win:
         self.m.chromium.process_dumps()
 
       if self.m.chromium.c.TARGET_PLATFORM == 'android':
         self.m.chromium_android.common_tests_final_steps()