Whitelist beta and dev channel ids for spark.

chrome/common/extensions/api/_permission_features.json

 // Copyright (c) 2012 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.
 
 // This features file defines permissions for extension APIs implemented
 // under src/chrome.
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 
 // To add a new whitelisted ID, SHA-1 it and force it to uppercase. In Bash:
@@ skipping 277 matching lines @@
   "developerPrivate": {
     "channel": "stable",
     "extension_types": ["platform_app"],
     "whitelist": [
         "AE27D69DBE571F4B1694F05C89B710C646792231", // Published ADT.
         // TODO(grv): clean up once Apps developer tool is published.
         "5107DE9024C329EEA9C9A72D94C16723790C6422",  // Apps Developer Tool.
         "8C0B1873FFFB65E4D0F4D772879F7304CEF125C2",  // Apps Editor old.
         // TODO(grv) : clean up once after publish.
         "FA0501B579070BB9CBD4FCAEC8CB0EDF22BA2F04", // Apps Editor published.
-        "4A4EA121622FCA3D78ED2AB534197F43D7189EE0", // Spark nightly build
-        "9FDE6E7F06FCFA11D9A05041C7FF6D8AE662F5D1"  // Spark release
+        "4A4EA121622FCA3D78ED2AB534197F43D7189EE0", // Spark nightly build.
+        "9FDE6E7F06FCFA11D9A05041C7FF6D8AE662F5D1", // Spark release.
+        "50B4A905D522C06E27CA6D099E3E54BDA1F152C5", // Spark Beta channel.
+        "BA0C8BB92084C9741312D90D3EA882526853455F"  // Spark dev channel.
     ]
   },
   "devtools": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
   },
   "declarativeContent": {
     "channel": "stable",
     "extension_types": ["extension"]
   },
@@ skipping 680 matching lines @@
     // Only allowed for whitelisted extensions until all the caveats are
     // addressed. Tracked in crbug/285151.
     "channel": "stable",
     "extension_types": ["extension"],
     "location": "component",
     "whitelist": [
       "D519188F86D9ACCEE0412007B227D9936EB9676B"  // GAIA Component Extension
     ]
   }]
 }