WebRTC: Enable bot_update for standalone recipe.

scripts/slave/bot_update.py

Index: scripts/slave/bot_update.py
diff --git a/scripts/slave/bot_update.py b/scripts/slave/bot_update.py
index 856c4d7b462baf42dbc5d6fae226f57664d78cbd..242c2f45e43c1613a290c81128e5c73fce8ca62f 100755
--- a/scripts/slave/bot_update.py
+++ b/scripts/slave/bot_update.py
@@ -212,6 +212,8 @@ RECOGNIZED_PATHS = {
         CHROMIUM_GIT_HOST + '/v8/v8.git',
     '/chrome/trunk/src/tools/cros.DEPS':
         CHROMIUM_GIT_HOST + '/chromium/src/tools/cros.DEPS.git',
+    '/webrtc/trunk':
+        CHROMIUM_GIT_HOST + '/external/webrtc.git',
 }
 RECOGNIZED_PATHS.update(internal_data.get('RECOGNIZED_PATHS', {}))
 
@@ -261,9 +263,10 @@ ENABLED_BUILDERS = {
         'Chromium Win SyzyASAN',
     ],
     'tryserver.webrtc': [
-        'android_apk',
-        'android_apk_rel',
-    ],
+        'linux',
+        'mac',
+        'win',
+     ],
 }
 ENABLED_BUILDERS.update(internal_data.get('ENABLED_BUILDERS', {}))