Tried to add keyboard shortcuts to trigger switch access commands. Maybe missing a permission.

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 chrome/common/extensions/api/_features.md to understand this file, as
 // well as feature.h, simple_feature.h, and feature_provider.h.
 
 // If you add a new platform_app permission please update the "stubs_app" test:
@@ skipping 156 matching lines @@
   "commandLinePrivate": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "platform_app"],
     "location": "component"
   },
   "commands.accessibility": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "platform_app"],
     "whitelist": [
       "2FCBCE08B34CCA1728A85F1EFBD9A34DD2558B2E",  // http://crbug.com/404768
-      "75C7F4B720314B6CB1B5817CD86089DB95CD2461"  // http://crbug.com/404768
+      "75C7F4B720314B6CB1B5817CD86089DB95CD2461",  // http://crbug.com/404768
+      "4D725C894DA4CF1F4D96C60F0D83BD745EB530CA"   // http://crbug.com/593885
     ]
   },
   "contentSettings": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
   },
   "contextMenus": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "platform_app"]
   },
@@ skipping 762 matching lines @@
     "channel": "stable",
     "extension_types": ["platform_app"],
     "platforms": ["chromeos"],
     "whitelist": [
       "A948368FC53BE437A55FEB414106E207925482F5",  // Files app
       "8C726564C6DBE7380BAB388DE6CC7EC93EB44B06",  // Video player
       "5065C83E84321221675D20FBE4DC43C655CC8C6F"   // Files app tests
     ]
   }
 }