Merge MB, installer build changes for official CrOS builders to M53.

tools/mb/mb_config.pyl

Index: tools/mb/mb_config.pyl
diff --git a/tools/mb/mb_config.pyl b/tools/mb/mb_config.pyl
index 9ecb7394253bbcf0367cc52282129f7288e6c46f..a87c82578552b1af5be6b8cee1be721f1ca600f4 100644
--- a/tools/mb/mb_config.pyl
+++ b/tools/mb/mb_config.pyl
@@ -11,6 +11,11 @@
     # include a configuration with 'chrome_with_codecs' since these builders
     # generated publicly advertised non-Official builds which are not allowed
     # to have proprietary codecs enabled.
+    'chromeos.chrome': {
+      'Chrome4CROS Packages': 'swarming_chromeos_gn_release_bot',
+      'Linux ChromeOS Buildspec Tests': 'swarming_chromeos_gn_release_bot',
+    },
+
     'chromium': {
       'Android': 'android_without_codecs_gn_release_bot_minimal_symbols',
       'Linux x64': 'noswarming_gn_release_bot',