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

scripts/slave/recipe_modules/webrtc/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.
 
 # Contains the bulk of the WebRTC builder configurations so they can be reused
 # from multiple recipes.
 
 RECIPE_CONFIGS = {
   'webrtc': {
     'webrtc_config': 'webrtc',
@@ skipping 782 matching lines @@
     'builders':  {
       'Linux64 Debug (parallel)': {
         'recipe_config': 'webrtc_parallel',
         'webrtc_config_kwargs': {
           'BUILD_CONFIG': 'Debug',
           'TARGET_BITS': 64,
         },
         'bot_type': 'builder_tester',
         'testing': {'platform': 'linux'},
       },
-    },
+      'Linux MSan': {
+        'recipe_config': 'webrtc_clang',
+        'chromium_apply_config': ['msan', 'instrumented_libraries'],
+        'webrtc_config_kwargs': {
+          'BUILD_CONFIG': 'Release',
+          'TARGET_BITS': 64,
+        },
+        'bot_type': 'builder_tester',
+        'testing': {'platform': 'linux'},
+      },
+     },
   },
   'tryserver.webrtc': {
     'builders': {
       'win': {
         'recipe_config': 'webrtc',
         'webrtc_config_kwargs': {
           'BUILD_CONFIG': 'Debug',
           'TARGET_BITS': 32,
         },
         'bot_type': 'builder_tester',
@@ skipping 267 matching lines @@
           'TARGET_BITS': 32,
         },
         'chromium_apply_config': ['webrtc_gn'],
         'bot_type': 'builder',
         'testing': {'platform': 'linux'},
       },
     },
   },
 }