Chrome扩展程序声明权限混乱

Question

Simple extension to assign a keyboard shortcut to the high contrast setting so as to toggle it without going through menu's. Problem: The code below is producing this error

ChromeSetting.get: You do not have permission to access the preference 'highContrast'. Be sure to declare in your manifest what permissions you need.

The intro to this API https://developer.chrome.com/extensions/accessibilityFeatures#property-highContrast says to declare accessibilityFeatures.modify and accessibilityFeatures.read which I've done, however both these permissions are not on the declared permissions list https://developer.chrome.com/extensions/declare_permissions so I'm not sure where to go from here...

manifest.json

{
  "name": "High Contrast Shortcut",
  "description": "Press Ctrl+Shift+Y to send an event.",
  "version": "1.0",
  "default_locale": "en",
  "manifest_version": 2,
  "background": {
    "scripts": ["src/bg/background.js"],
    "persistent": true
  },
  "permissions": [
    "accessibilityFeatures.read",
    "accessibilityFeatures.modify"
  ],
  "commands": {
    "toggle-feature": {
      "suggested_key": { "default": "Ctrl+Shift+Y" },
      "description": "Send a 'toggle-feature' event to the extension"
    }
  }
}

background.js

chrome.commands.onCommand.addListener(function(command) {
  if (command == "toggle-feature") {

    var value = chrome.accessibilityFeatures.highContrast.get({'incognito': false}, function (callback) {
      console.log(callback);
    });
  }
});

Answer 1

"accessibilityFeatures.read" and "accessibilityFeatures.modify" are currently only supported in Chrome OS, not on other operating systems, as seen in https://chromium.googlesource.com/chromium/src/+/7c61e0145f3e598ae7a9ac69159234d6ec7f6008/chrome/common/extensions/api/_permission_features.json :

  "accessibilityFeatures.modify": {
    "channel": "stable",
    "extension_types": ["extension", "platform_app"],
    "platforms": ["chromeos"]
  },
  "accessibilityFeatures.read": {
    "channel": "stable",
    "extension_types": ["extension", "platform_app"],
    "platforms": ["chromeos"]
  },